Please provide the output of qdbus org.kde.KWin /KWin supportInformation when the problem is visible.

(In reply to Martin Flöser from comment #1)
> Please provide the output of qdbus org.kde.KWin /KWin supportInformation
> when the problem is visible.


Hi,

Apparently I don't have it:

ehellou@elxaf7qtt32:~$ qdbus org.kde.KWin /KWin supportInformation
Service 'org.kde.KWin' does not exist.
ehellou@elxaf7qtt32:~$ qdbus | grep -i kwin
ehellou@elxaf7qtt32:~$ qdbus | grep -i org.kde
 org.kde.kglobalaccel
 org.kde.ksmserver
 org.kde.screensaver
 org.kde.KScreen
 org.kde.krunner
 org.kde.kdeconnect
 org.kde.kdeconnectd
 org.kde.polkit-kde-authentication-agent-1
 org.kde.StatusNotifierHost-11224
 org.kde.plasmashell
 local.org_kde_powerdevil
 org.kde.Solid.PowerManagement
 org.kde.Solid.PowerManagement.PolicyAgent
 org.kde.ActivityManager
 org.kde.korgac
 org.kde.StatusNotifierWatcher
 org.kde.kcookiejar5
 org.kde.kded5
 org.kde.keyboard
 org.kde.plasmanetworkmanagement
 org.kde.klauncher
 org.kde.kded
 org.kde.knotify
 org.kde.kaccess
 org.kde.JobViewServer
 org.kde.kuiserver
 org.kde.klauncher5
 org.kde.konsole
 org.kde.kwalletd
 org.kde.kwalletd5
 org.kde.StatusNotifierItem-14109-1
 org.kde.kate-19087

I have the same problem, both with Intel and with amdgpu.  I am on Mesa 18.1, KDE 5.12.90 (5.13 beta)

Here's the output of the requested diagnostic:

> qdbus org.kde.KWin /KWin
signal void org.kde.KWin.reloadConfig()
method Q_NOREPLY void org.kde.KWin.cascadeDesktop()
method int org.kde.KWin.currentDesktop()
method Q_NOREPLY void org.kde.KWin.killWindow()
method void org.kde.KWin.nextDesktop()
method void org.kde.KWin.previousDesktop()
method QVariantMap org.kde.KWin.queryWindowInfo()
method Q_NOREPLY void org.kde.KWin.reconfigure()
method bool org.kde.KWin.setCurrentDesktop(int desktop)
method void org.kde.KWin.showDebugConsole()
method bool org.kde.KWin.startActivity(QString)
method bool org.kde.KWin.stopActivity(QString)
method QString org.kde.KWin.supportInformation()
method Q_NOREPLY void org.kde.KWin.unclutterDesktop()
signal void org.freedesktop.DBus.Properties.PropertiesChanged(QString interface_name, QVariantMap changed_properties, QStringList invalidated_properties)
method QDBusVariant org.freedesktop.DBus.Properties.Get(QString interface_name, QString property_name)
method QVariantMap org.freedesktop.DBus.Properties.GetAll(QString interface_name)
method void org.freedesktop.DBus.Properties.Set(QString interface_name, QString property_name, QDBusVariant value)
method QString org.freedesktop.DBus.Introspectable.Introspect()
method QString org.freedesktop.DBus.Peer.GetMachineId()
method void org.freedesktop.DBus.Peer.Ping()

Here's a head of glxinfo, if that is useful:

name of display: :0
display: :0  screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_no_error, 
    GLX_ARB_create_context_profile, GLX_ARB_create_context_robustness, 
    GLX_ARB_fbconfig_float, GLX_ARB_framebuffer_sRGB, GLX_ARB_multisample, 
    GLX_EXT_create_context_es2_profile, GLX_EXT_create_context_es_profile, 
    GLX_EXT_fbconfig_packed_float, GLX_EXT_framebuffer_sRGB, 
    GLX_EXT_import_context, GLX_EXT_libglvnd, GLX_EXT_no_config_context, 
    GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating, 
    GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer, GLX_OML_swap_method, 
    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, 
    GLX_SGIX_visual_select_group, GLX_SGI_make_current_read, 
    GLX_SGI_swap_control
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
client glx extensions:
    GLX_ARB_context_flush_control, GLX_ARB_create_context, 
    GLX_ARB_create_context_profile, GLX_ARB_create_context_robustness, 
    GLX_ARB_fbconfig_float, GLX_ARB_framebuffer_sRGB, 
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_buffer_age, 
    GLX_EXT_create_context_es2_profile, GLX_EXT_create_context_es_profile, 
    GLX_EXT_fbconfig_packed_float, GLX_EXT_framebuffer_sRGB, 
    GLX_EXT_import_context, GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, 
    GLX_EXT_visual_rating, GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer, 
    GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer, 
    GLX_MESA_swap_control, GLX_OML_swap_method, GLX_OML_sync_control, 
    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, 
    GLX_SGIX_visual_select_group, GLX_SGI_make_current_read, 
    GLX_SGI_swap_control, GLX_SGI_video_sync
GLX version: 1.4
GLX extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile, 
    GLX_ARB_create_context_robustness, GLX_ARB_fbconfig_float, 
    GLX_ARB_framebuffer_sRGB, GLX_ARB_get_proc_address, GLX_ARB_multisample, 
    GLX_EXT_buffer_age, GLX_EXT_create_context_es2_profile, 
    GLX_EXT_create_context_es_profile, GLX_EXT_fbconfig_packed_float, 
    GLX_EXT_framebuffer_sRGB, GLX_EXT_import_context, 
    GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating, 
    GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer, 
    GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer, 
    GLX_MESA_swap_control, GLX_OML_swap_method, GLX_OML_sync_control, 
    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, 
    GLX_SGIX_visual_select_group, GLX_SGI_make_current_read, 
    GLX_SGI_swap_control, GLX_SGI_video_sync
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: X.Org (0x1002)
    Device: Radeon RX 550 Series (POLARIS12, DRM 3.25.0, 4.17.0-rc6-GTW1+, LLVM 6.0.0) (0x699f)
    Version: 18.1.0
    Accelerated: yes
    Video memory: 1947MB
    Unified memory: no
    Preferred profile: core (0x1)
    Max core profile version: 4.5
    Max compat profile version: 3.1
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.1
Memory info (GL_ATI_meminfo):
    VBO free memory - total: 1946 MB, largest block: 1946 MB
    VBO free aux. memory - total: 3068 MB, largest block: 3068 MB
    Texture free memory - total: 1946 MB, largest block: 1946 MB
    Texture free aux. memory - total: 3068 MB, largest block: 3068 MB
    Renderbuffer free memory - total: 1946 MB, largest block: 1946 MB
    Renderbuffer free aux. memory - total: 3068 MB, largest block: 3068 MB
Memory info (GL_NVX_gpu_memory_info):
    Dedicated video memory: 1947 MB
    Total available memory: 5016 MB
    Currently available dedicated video memory: 1946 MB
OpenGL vendor string: X.Org
OpenGL renderer string: Radeon RX 550 Series (POLARIS12, DRM 3.25.0, 4.17.0-rc6-GTW1+, LLVM 6.0.0)
OpenGL core profile version string: 4.5 (Core Profile) Mesa 18.1.0
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
    GL_AMD_conservative_depth, GL_AMD_draw_buffers_blend, 
    GL_AMD_performance_monitor, GL_AMD_pinned_memory, 
    GL_AMD_seamless_cubemap_per_texture, GL_AMD_shader_stencil_export, 
    GL_AMD_shader_trinary_minmax, GL_AMD_vertex_shader_layer, 
    GL_AMD_vertex_shader_viewport_index, GL_ANGLE_texture_compression_dxt3, 
    GL_ANGLE_texture_compression_dxt5, GL_ARB_ES2_compatibility, 
    GL_ARB_ES3_1_compatibility, GL_ARB_ES3_2_compatibility, 
    GL_ARB_ES3_compatibility, GL_ARB_arrays_of_arrays, GL_ARB_base_instance, 
    GL_ARB_bindless_texture, GL_ARB_blend_func_extended, 
    GL_ARB_buffer_storage, GL_ARB_clear_buffer_object, GL_ARB_clear_texture, 
    GL_ARB_clip_control, GL_ARB_color_buffer_float, 
    GL_ARB_compressed_texture_pixel_storage, GL_ARB_compute_shader, 
    GL_ARB_compute_variable_group_size, GL_ARB_conditional_render_inverted, 
    GL_ARB_conservative_depth, GL_ARB_copy_buffer, GL_ARB_copy_image, 
    GL_ARB_cull_distance, GL_ARB_debug_output, GL_ARB_depth_buffer_float, 
    GL_ARB_depth_clamp, GL_ARB_derivative_control, GL_ARB_direct_state_access, 
    GL_ARB_draw_buffers, GL_ARB_draw_buffers_blend, 
    GL_ARB_draw_elements_base_vertex, GL_ARB_draw_indirect, 
    GL_ARB_draw_instanced, GL_ARB_enhanced_layouts, 
    GL_ARB_explicit_attrib_location, GL_ARB_explicit_uniform_location, 
    GL_ARB_fragment_coord_conventions, GL_ARB_fragment_layer_viewport, 
    GL_ARB_fragment_shader, GL_ARB_framebuffer_no_attachments, 
    GL_ARB_framebuffer_object, GL_ARB_framebuffer_sRGB, 
    GL_ARB_get_program_binary, GL_ARB_get_texture_sub_image, 
    GL_ARB_gpu_shader5, GL_ARB_gpu_shader_fp64, GL_ARB_gpu_shader_int64, 
    GL_ARB_half_float_pixel, GL_ARB_half_float_vertex, 
    GL_ARB_indirect_parameters, GL_ARB_instanced_arrays, 
    GL_ARB_internalformat_query, GL_ARB_internalformat_query2, 
    GL_ARB_invalidate_subdata, GL_ARB_map_buffer_alignment, 
    GL_ARB_map_buffer_range, GL_ARB_multi_bind, GL_ARB_multi_draw_indirect, 
    GL_ARB_occlusion_query2, GL_ARB_pipeline_statistics_query, 
    GL_ARB_pixel_buffer_object, GL_ARB_point_sprite, 
    GL_ARB_polygon_offset_clamp, GL_ARB_program_interface_query, 
    GL_ARB_provoking_vertex, GL_ARB_query_buffer_object, 
    GL_ARB_robust_buffer_access_behavior, GL_ARB_robustness, 
    GL_ARB_sample_shading, GL_ARB_sampler_objects, GL_ARB_seamless_cube_map, 
    GL_ARB_seamless_cubemap_per_texture, GL_ARB_separate_shader_objects, 
    GL_ARB_shader_atomic_counter_ops, GL_ARB_shader_atomic_counters, 
    GL_ARB_shader_ballot, GL_ARB_shader_bit_encoding, GL_ARB_shader_clock, 
    GL_ARB_shader_draw_parameters, GL_ARB_shader_group_vote, 
    GL_ARB_shader_image_load_store, GL_ARB_shader_image_size, 
    GL_ARB_shader_objects, GL_ARB_shader_precision, 
    GL_ARB_shader_stencil_export, GL_ARB_shader_storage_buffer_object, 
    GL_ARB_shader_subroutine, GL_ARB_shader_texture_image_samples, 
    GL_ARB_shader_texture_lod, GL_ARB_shader_viewport_layer_array, 
    GL_ARB_shading_language_420pack, GL_ARB_shading_language_packing, 
    GL_ARB_sparse_buffer, GL_ARB_stencil_texturing, GL_ARB_sync, 
    GL_ARB_tessellation_shader, GL_ARB_texture_barrier, 
    GL_ARB_texture_buffer_object, GL_ARB_texture_buffer_object_rgb32, 
    GL_ARB_texture_buffer_range, GL_ARB_texture_compression_bptc, 
    GL_ARB_texture_compression_rgtc, GL_ARB_texture_cube_map_array, 
    GL_ARB_texture_filter_anisotropic, GL_ARB_texture_float, 
    GL_ARB_texture_gather, GL_ARB_texture_mirror_clamp_to_edge, 
    GL_ARB_texture_multisample, GL_ARB_texture_non_power_of_two, 
    GL_ARB_texture_query_levels, GL_ARB_texture_query_lod, 
    GL_ARB_texture_rectangle, GL_ARB_texture_rg, GL_ARB_texture_rgb10_a2ui, 
    GL_ARB_texture_stencil8, GL_ARB_texture_storage, 
    GL_ARB_texture_storage_multisample, GL_ARB_texture_swizzle, 
    GL_ARB_texture_view, GL_ARB_timer_query, GL_ARB_transform_feedback2, 
    GL_ARB_transform_feedback3, GL_ARB_transform_feedback_instanced, 
    GL_ARB_transform_feedback_overflow_query, GL_ARB_uniform_buffer_object, 
    GL_ARB_vertex_array_bgra, GL_ARB_vertex_array_object, 
    GL_ARB_vertex_attrib_64bit, GL_ARB_vertex_attrib_binding, 
    GL_ARB_vertex_shader, GL_ARB_vertex_type_10f_11f_11f_rev, 
    GL_ARB_vertex_type_2_10_10_10_rev, GL_ARB_viewport_array, 
    GL_ATI_blend_equation_separate, GL_ATI_meminfo, GL_ATI_texture_float, 
    GL_ATI_texture_mirror_once, GL_EXT_abgr, GL_EXT_blend_equation_separate, 
    GL_EXT_depth_bounds_test, GL_EXT_draw_buffers2, GL_EXT_draw_instanced, 
    GL_EXT_framebuffer_blit, GL_EXT_framebuffer_multisample, 
    GL_EXT_framebuffer_multisample_blit_scaled, GL_EXT_framebuffer_sRGB, 
    GL_EXT_memory_object, GL_EXT_memory_object_fd, 
    GL_EXT_packed_depth_stencil, GL_EXT_packed_float, 
    GL_EXT_pixel_buffer_object, GL_EXT_polygon_offset_clamp, 
    GL_EXT_provoking_vertex, GL_EXT_semaphore, GL_EXT_semaphore_fd, 
    GL_EXT_shader_integer_mix, GL_EXT_texture_array, 
    GL_EXT_texture_compression_dxt1, GL_EXT_texture_compression_rgtc, 
    GL_EXT_texture_compression_s3tc, GL_EXT_texture_filter_anisotropic, 
    GL_EXT_texture_integer, GL_EXT_texture_mirror_clamp, GL_EXT_texture_sRGB, 
    GL_EXT_texture_sRGB_decode, GL_EXT_texture_shared_exponent, 
    GL_EXT_texture_snorm, GL_EXT_texture_swizzle, GL_EXT_timer_query, 
    GL_EXT_transform_feedback, GL_EXT_vertex_array_bgra, 
    GL_IBM_multimode_draw_arrays, GL_KHR_blend_equation_advanced, 
    GL_KHR_context_flush_control, GL_KHR_debug, GL_KHR_no_error, 
    GL_KHR_robust_buffer_access_behavior, GL_KHR_robustness, 
    GL_MESA_pack_invert, GL_MESA_shader_integer_functions, 
    GL_MESA_texture_signed_rgba, GL_NVX_gpu_memory_info, 
    GL_NV_conditional_render, GL_NV_depth_clamp, GL_NV_packed_depth_stencil, 
    GL_NV_texture_barrier, GL_NV_vdpau_interop, GL_OES_EGL_image, GL_S3_s3tc

OpenGL version string: 3.1 Mesa 18.1.0
OpenGL shading language version string: 1.40
OpenGL context flags: (none)
OpenGL extensions:
    GL_AMD_conservative_depth, GL_AMD_draw_buffers_blend, 
    GL_AMD_performance_monitor, GL_AMD_pinned_memory, 
    GL_AMD_seamless_cubemap_per_texture, GL_AMD_shader_stencil_export, 
    GL_AMD_shader_trinary_minmax, GL_ANGLE_texture_compression_dxt3, 
    GL_ANGLE_texture_compression_dxt5, GL_APPLE_packed_pixels, 
    GL_ARB_ES2_compatibility, GL_ARB_ES3_compatibility, 
    GL_ARB_arrays_of_arrays, GL_ARB_base_instance, GL_ARB_bindless_texture, 
    GL_ARB_blend_func_extended, GL_ARB_buffer_storage, 
    GL_ARB_clear_buffer_object, GL_ARB_clear_texture, GL_ARB_clip_control, 
    GL_ARB_color_buffer_float, GL_ARB_compatibility, 
    GL_ARB_compressed_texture_pixel_storage, GL_ARB_compute_shader, 
    GL_ARB_compute_variable_group_size, GL_ARB_conditional_render_inverted, 
    GL_ARB_conservative_depth, GL_ARB_copy_buffer, GL_ARB_copy_image, 
    GL_ARB_cull_distance, GL_ARB_debug_output, GL_ARB_depth_buffer_float, 
    GL_ARB_depth_clamp, GL_ARB_depth_texture, GL_ARB_derivative_control, 
    GL_ARB_draw_buffers, GL_ARB_draw_buffers_blend, 
    GL_ARB_draw_elements_base_vertex, GL_ARB_draw_instanced, 
    GL_ARB_enhanced_layouts, GL_ARB_explicit_attrib_location, 
    GL_ARB_explicit_uniform_location, GL_ARB_fragment_coord_conventions, 
    GL_ARB_fragment_program, GL_ARB_fragment_program_shadow, 
    GL_ARB_fragment_shader, GL_ARB_framebuffer_no_attachments, 
    GL_ARB_framebuffer_object, GL_ARB_framebuffer_sRGB, 
    GL_ARB_get_program_binary, GL_ARB_get_texture_sub_image, 
    GL_ARB_half_float_pixel, GL_ARB_half_float_vertex, 
    GL_ARB_instanced_arrays, GL_ARB_internalformat_query, 
    GL_ARB_internalformat_query2, GL_ARB_invalidate_subdata, 
    GL_ARB_map_buffer_alignment, GL_ARB_map_buffer_range, GL_ARB_multi_bind, 
    GL_ARB_multisample, GL_ARB_multitexture, GL_ARB_occlusion_query, 
    GL_ARB_occlusion_query2, GL_ARB_pipeline_statistics_query, 
    GL_ARB_pixel_buffer_object, GL_ARB_point_parameters, GL_ARB_point_sprite, 
    GL_ARB_polygon_offset_clamp, GL_ARB_program_interface_query, 
    GL_ARB_provoking_vertex, GL_ARB_query_buffer_object, 
    GL_ARB_robust_buffer_access_behavior, GL_ARB_robustness, 
    GL_ARB_sample_shading, GL_ARB_sampler_objects, GL_ARB_seamless_cube_map, 
    GL_ARB_seamless_cubemap_per_texture, GL_ARB_separate_shader_objects, 
    GL_ARB_shader_atomic_counter_ops, GL_ARB_shader_atomic_counters, 
    GL_ARB_shader_ballot, GL_ARB_shader_bit_encoding, GL_ARB_shader_clock, 
    GL_ARB_shader_draw_parameters, GL_ARB_shader_group_vote, 
    GL_ARB_shader_image_load_store, GL_ARB_shader_image_size, 
    GL_ARB_shader_objects, GL_ARB_shader_precision, 
    GL_ARB_shader_stencil_export, GL_ARB_shader_storage_buffer_object, 
    GL_ARB_shader_texture_image_samples, GL_ARB_shader_texture_lod, 
    GL_ARB_shading_language_100, GL_ARB_shading_language_420pack, 
    GL_ARB_shading_language_packing, GL_ARB_shadow, GL_ARB_sparse_buffer, 
    GL_ARB_stencil_texturing, GL_ARB_sync, GL_ARB_texture_barrier, 
    GL_ARB_texture_border_clamp, GL_ARB_texture_buffer_object, 
    GL_ARB_texture_buffer_object_rgb32, GL_ARB_texture_buffer_range, 
    GL_ARB_texture_compression, GL_ARB_texture_compression_bptc, 
    GL_ARB_texture_compression_rgtc, GL_ARB_texture_cube_map, 
    GL_ARB_texture_cube_map_array, GL_ARB_texture_env_add, 
    GL_ARB_texture_env_combine, GL_ARB_texture_env_crossbar, 
    GL_ARB_texture_env_dot3, GL_ARB_texture_filter_anisotropic, 
    GL_ARB_texture_float, GL_ARB_texture_gather, 
    GL_ARB_texture_mirror_clamp_to_edge, GL_ARB_texture_mirrored_repeat, 
    GL_ARB_texture_multisample, GL_ARB_texture_non_power_of_two, 
    GL_ARB_texture_query_levels, GL_ARB_texture_query_lod, 
    GL_ARB_texture_rectangle, GL_ARB_texture_rg, GL_ARB_texture_rgb10_a2ui, 
    GL_ARB_texture_stencil8, GL_ARB_texture_storage, 
    GL_ARB_texture_storage_multisample, GL_ARB_texture_swizzle, 
    GL_ARB_texture_view, GL_ARB_timer_query, GL_ARB_transform_feedback2, 
    GL_ARB_transform_feedback3, GL_ARB_transform_feedback_instanced, 
    GL_ARB_transform_feedback_overflow_query, GL_ARB_transpose_matrix, 
    GL_ARB_uniform_buffer_object, GL_ARB_vertex_array_bgra, 
    GL_ARB_vertex_array_object, GL_ARB_vertex_attrib_binding, 
    GL_ARB_vertex_buffer_object, GL_ARB_vertex_program, GL_ARB_vertex_shader, 
    GL_ARB_vertex_type_10f_11f_11f_rev, GL_ARB_vertex_type_2_10_10_10_rev, 
    GL_ARB_window_pos, GL_ATI_blend_equation_separate, GL_ATI_draw_buffers, 
    GL_ATI_fragment_shader, GL_ATI_meminfo, GL_ATI_separate_stencil, 
    GL_ATI_texture_compression_3dc, GL_ATI_texture_env_combine3, 
    GL_ATI_texture_float, GL_ATI_texture_mirror_once, GL_EXT_abgr, 
    GL_EXT_bgra, GL_EXT_blend_color, GL_EXT_blend_equation_separate, 
    GL_EXT_blend_func_separate, GL_EXT_blend_minmax, GL_EXT_blend_subtract, 
    GL_EXT_compiled_vertex_array, GL_EXT_copy_texture, 
    GL_EXT_depth_bounds_test, GL_EXT_draw_buffers2, GL_EXT_draw_instanced, 
    GL_EXT_draw_range_elements, GL_EXT_fog_coord, GL_EXT_framebuffer_blit, 
    GL_EXT_framebuffer_multisample, GL_EXT_framebuffer_multisample_blit_scaled, 
    GL_EXT_framebuffer_object, GL_EXT_framebuffer_sRGB, 
    GL_EXT_gpu_program_parameters, GL_EXT_memory_object, 
    GL_EXT_memory_object_fd, GL_EXT_multi_draw_arrays, 
    GL_EXT_packed_depth_stencil, GL_EXT_packed_float, GL_EXT_packed_pixels, 
    GL_EXT_pixel_buffer_object, GL_EXT_point_parameters, 
    GL_EXT_polygon_offset, GL_EXT_polygon_offset_clamp, 
    GL_EXT_provoking_vertex, GL_EXT_rescale_normal, GL_EXT_secondary_color, 
    GL_EXT_semaphore, GL_EXT_semaphore_fd, GL_EXT_separate_specular_color, 
    GL_EXT_shader_integer_mix, GL_EXT_shadow_funcs, GL_EXT_stencil_two_side, 
    GL_EXT_stencil_wrap, GL_EXT_subtexture, GL_EXT_texture, GL_EXT_texture3D, 
    GL_EXT_texture_array, GL_EXT_texture_compression_dxt1, 
    GL_EXT_texture_compression_latc, GL_EXT_texture_compression_rgtc, 
    GL_EXT_texture_compression_s3tc, GL_EXT_texture_cube_map, 
    GL_EXT_texture_edge_clamp, GL_EXT_texture_env_add, 
    GL_EXT_texture_env_combine, GL_EXT_texture_env_dot3, 
    GL_EXT_texture_filter_anisotropic, GL_EXT_texture_integer, 
    GL_EXT_texture_lod_bias, GL_EXT_texture_mirror_clamp, 
    GL_EXT_texture_object, GL_EXT_texture_rectangle, GL_EXT_texture_sRGB, 
    GL_EXT_texture_sRGB_decode, GL_EXT_texture_shared_exponent, 
    GL_EXT_texture_snorm, GL_EXT_texture_swizzle, GL_EXT_timer_query, 
    GL_EXT_transform_feedback, GL_EXT_vertex_array, GL_EXT_vertex_array_bgra, 
    GL_IBM_multimode_draw_arrays, GL_IBM_rasterpos_clip, 
    GL_IBM_texture_mirrored_repeat, GL_INGR_blend_func_separate, 
    GL_KHR_blend_equation_advanced, GL_KHR_context_flush_control, 
    GL_KHR_debug, GL_KHR_no_error, GL_KHR_robust_buffer_access_behavior, 
    GL_KHR_robustness, GL_MESA_pack_invert, GL_MESA_shader_integer_functions, 
    GL_MESA_texture_signed_rgba, GL_MESA_window_pos, GL_NVX_gpu_memory_info, 
    GL_NV_blend_square, GL_NV_conditional_render, GL_NV_depth_clamp, 
    GL_NV_fog_distance, GL_NV_light_max_exponent, GL_NV_packed_depth_stencil, 
    GL_NV_primitive_restart, GL_NV_texgen_reflection, GL_NV_texture_barrier, 
    GL_NV_texture_env_combine4, GL_NV_texture_rectangle, GL_NV_vdpau_interop, 
    GL_OES_EGL_image, GL_OES_read_format, GL_S3_s3tc, 
    GL_SGIS_generate_mipmap, GL_SGIS_texture_border_clamp, 
    GL_SGIS_texture_edge_clamp, GL_SGIS_texture_lod, GL_SUN_multi_draw_arrays

OpenGL ES profile version string: OpenGL ES 3.1 Mesa 18.1.0
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.10
OpenGL ES profile extensions:
    GL_ANGLE_texture_compression_dxt3, GL_ANGLE_texture_compression_dxt5, 
    GL_APPLE_texture_max_level, GL_EXT_base_instance, 
    GL_EXT_blend_func_extended, GL_EXT_blend_minmax, GL_EXT_buffer_storage, 
    GL_EXT_clip_cull_distance, GL_EXT_color_buffer_float, 
    GL_EXT_compressed_ETC1_RGB8_sub_texture, GL_EXT_copy_image, 
    GL_EXT_discard_framebuffer, GL_EXT_draw_buffers, 
    GL_EXT_draw_buffers_indexed, GL_EXT_draw_elements_base_vertex, 
    GL_EXT_frag_depth, GL_EXT_geometry_point_size, GL_EXT_geometry_shader, 
    GL_EXT_gpu_shader5, GL_EXT_map_buffer_range, GL_EXT_memory_object, 
    GL_EXT_memory_object_fd, GL_EXT_multi_draw_arrays, 
    GL_EXT_occlusion_query_boolean, GL_EXT_polygon_offset_clamp, 
    GL_EXT_primitive_bounding_box, GL_EXT_read_format_bgra, GL_EXT_robustness, 
    GL_EXT_semaphore, GL_EXT_semaphore_fd, GL_EXT_separate_shader_objects, 
    GL_EXT_shader_integer_mix, GL_EXT_shader_io_blocks, 
    GL_EXT_tessellation_point_size, GL_EXT_tessellation_shader, 
    GL_EXT_texture_border_clamp, GL_EXT_texture_buffer, 
    GL_EXT_texture_compression_dxt1, GL_EXT_texture_cube_map_array, 
    GL_EXT_texture_filter_anisotropic, GL_EXT_texture_format_BGRA8888, 
    GL_EXT_texture_rg, GL_EXT_texture_sRGB_decode, 
    GL_EXT_texture_type_2_10_10_10_REV, GL_EXT_unpack_subimage, 
    GL_KHR_blend_equation_advanced, GL_KHR_context_flush_control, 
    GL_KHR_debug, GL_KHR_no_error, GL_KHR_robust_buffer_access_behavior, 
    GL_KHR_robustness, GL_MESA_shader_integer_functions, GL_NV_draw_buffers, 
    GL_NV_fbo_color_attachments, GL_NV_image_formats, GL_NV_read_buffer, 
    GL_NV_read_depth, GL_NV_read_depth_stencil, GL_NV_read_stencil, 
    GL_OES_EGL_image, GL_OES_EGL_image_external, 
    GL_OES_EGL_image_external_essl3, GL_OES_EGL_sync, 
    GL_OES_compressed_ETC1_RGB8_texture, GL_OES_copy_image, GL_OES_depth24, 
    GL_OES_depth_texture, GL_OES_depth_texture_cube_map, 
    GL_OES_draw_buffers_indexed, GL_OES_draw_elements_base_vertex, 
    GL_OES_element_index_uint, GL_OES_fbo_render_mipmap, 
    GL_OES_geometry_point_size, GL_OES_geometry_shader, 
    GL_OES_get_program_binary, GL_OES_gpu_shader5, GL_OES_mapbuffer, 
    GL_OES_packed_depth_stencil, GL_OES_primitive_bounding_box, 
    GL_OES_required_internalformat, GL_OES_rgb8_rgba8, GL_OES_sample_shading, 
    GL_OES_sample_variables, GL_OES_shader_image_atomic, 
    GL_OES_shader_io_blocks, GL_OES_shader_multisample_interpolation, 
    GL_OES_standard_derivatives, GL_OES_stencil8, GL_OES_surfaceless_context, 
    GL_OES_tessellation_point_size, GL_OES_tessellation_shader, 
    GL_OES_texture_3D, GL_OES_texture_border_clamp, GL_OES_texture_buffer, 
    GL_OES_texture_cube_map_array, GL_OES_texture_float, 
    GL_OES_texture_float_linear, GL_OES_texture_half_float, 
    GL_OES_texture_half_float_linear, GL_OES_texture_npot, 
    GL_OES_texture_stencil8, GL_OES_texture_storage_multisample_2d_array, 
    GL_OES_vertex_array_object, GL_OES_vertex_half_float, 
    GL_OES_viewport_array

Am idiot.  Here's the support information:

https://paste.kde.org/pse1iairn/jtouni

Please add the supportInformation here and not in a password protected paste.

Sorry - it's public now.

Version
=======
KWin version: 5.12.90
Qt Version: 5.11.0
Qt compile version: 5.11.0
XCB compile version: 1.13

Operation Mode: X11 only

Build Options
=============
KWIN_BUILD_DECORATIONS: yes
KWIN_BUILD_TABBOX: yes
KWIN_BUILD_ACTIVITIES: yes
HAVE_DRM: yes
HAVE_GBM: yes
HAVE_X11_XCB: yes
HAVE_EPOXY_GLX: yes
HAVE_WAYLAND_EGL: yes

X11
===
Vendor: The X.Org Foundation
Vendor Release: 12099001
Protocol Version/Revision: 11/0
SHAPE: yes; Version: 0x11
RANDR: yes; Version: 0x14
DAMAGE: yes; Version: 0x11
Composite: yes; Version: 0x4
RENDER: yes; Version: 0xb
XFIXES: yes; Version: 0x50
SYNC: yes; Version: 0x31
GLX: yes; Version: 0x0

Decoration
==========
Plugin: org.kde.breeze
Theme: 
Blur: 0
onAllDesktopsAvailable: false
alphaChannelSupported: true
closeOnDoubleClickOnMenu: false
decorationButtonsLeft: 0, 2
decorationButtonsRight: 6, 3, 4, 5
borderSize: 3
gridUnit: 16
font: Noto Sans,10,-1,5,50,0,0,0,0,0,Regular
smallSpacing: 4
largeSpacing: 16

Platform
==========
Name: KWin::X11StandalonePlatform

Options
=======
focusPolicy: 0
nextFocusPrefersMouse: false
clickRaise: true
autoRaise: false
autoRaiseInterval: 0
delayFocusInterval: 0
shadeHover: false
shadeHoverInterval: 250
separateScreenFocus: false
placement: 4
focusPolicyIsReasonable: true
borderSnapZone: 10
windowSnapZone: 10
centerSnapZone: 0
snapOnlyWhenOverlapping: false
rollOverDesktops: true
focusStealingPreventionLevel: 1
legacyFullscreenSupport: false
operationTitlebarDblClick: 5000
operationMaxButtonLeftClick: 5000
operationMaxButtonMiddleClick: 5015
operationMaxButtonRightClick: 5014
commandActiveTitlebar1: 0
commandActiveTitlebar2: 30
commandActiveTitlebar3: 2
commandInactiveTitlebar1: 4
commandInactiveTitlebar2: 30
commandInactiveTitlebar3: 2
commandWindow1: 7
commandWindow2: 8
commandWindow3: 8
commandWindowWheel: 31
commandAll1: 10
commandAll2: 3
commandAll3: 14
keyCmdAllModKey: 16777251
showGeometryTip: false
condensedTitle: false
electricBorderMaximize: false
electricBorderTiling: false
electricBorderCornerRatio: 0.25
borderlessMaximizedWindows: false
killPingTimeout: 5000
hideUtilityWindowsForInactive: true
inactiveTabsSkipTaskbar: false
autogroupSimilarWindows: false
autogroupInForeground: true
compositingMode: 1
useCompositing: true
compositingInitialized: true
hiddenPreviews: 1
glSmoothScale: 2
xrenderSmoothScale: false
maxFpsInterval: 16666666
refreshRate: 0
vBlankTime: 6000000
glStrictBinding: true
glStrictBindingFollowsDriver: true
glCoreProfile: false
glPreferBufferSwap: 101
glPlatformInterface: 1
windowsBlockCompositing: true

Screen Edges
============
desktopSwitching: false
desktopSwitchingMovingClients: false
cursorPushBackDistance: 1x1
timeThreshold: 150
reActivateThreshold: 350
actionTopLeft: 0
actionTop: 0
actionTopRight: 0
actionRight: 0
actionBottomRight: 0
actionBottom: 0
actionBottomLeft: 0
actionLeft: 0

Screens
=======
Multi-Head: no
Active screen follows mouse:  no
Number of Screens: 1

Screen 0:
---------
Name: DisplayPort-0
Geometry: 0,0,2160x3840
Scale: 1
Refresh Rate: 59.9966


Compositing
===========
Compositing is active
Compositing Type: OpenGL
OpenGL vendor string: X.Org
OpenGL renderer string: Radeon RX 550 Series (POLARIS12, DRM 3.25.0, 4.17.0-rc6-GTW1+, LLVM 6.0.0)
OpenGL version string: 3.1 Mesa 18.1.0
OpenGL platform interface: GLX
OpenGL shading language version string: 1.40
Driver: Unknown
GPU class: Unknown
OpenGL version: 3.1
GLSL version: 1.40
Mesa version: 18.1
X server version: 1.20.99
Linux kernel version: 4.17
Direct rendering: Requires strict binding: yes
GLSL shaders:  yes
Texture NPOT support:  yes
Virtual Machine:  no
OpenGL 2 Shaders are used
Painting blocks for vertical retrace:  no

Loaded Effects:
---------------
zoom
kwin4_effect_windowaperture
kwin4_effect_frozenapp
kwin4_effect_translucency
kwin4_effect_logout
kwin4_effect_fade
kwin4_effect_login
kwin4_effect_dialogparent
kwin4_effect_morphingpopups
kwin4_effect_maximize
slidingpopups
wobblywindows
slide
screenshot
minimizeanimation
desktopgrid
colorpicker
presentwindows
highlightwindow
blur
contrast
startupfeedback
screenedge
kscreen

Currently Active Effects:
-------------------------
blur
contrast

Effect Settings:
----------------
zoom:
zoomFactor: 1.2
mousePointer: 0
mouseTracking: 0
enableFocusTracking: false
followFocus: true
focusDelay: 350
moveFactor: 20
targetZoom: 1

kwin4_effect_windowaperture:

kwin4_effect_frozenapp:

kwin4_effect_translucency:

kwin4_effect_logout:

kwin4_effect_fade:

kwin4_effect_login:

kwin4_effect_dialogparent:

kwin4_effect_morphingpopups:

kwin4_effect_maximize:

slidingpopups:
fadeInTime: 150
fadeOutTime: 250

wobblywindows:
stiffness: 0.15
drag: 0.8
moveFactor: 0.1
xTesselation: 20
yTesselation: 20
minVelocity: 0
maxVelocity: 1000
stopVelocity: 0.5
minAcceleration: 0
maxAcceleration: 1000
stopAcceleration: 0.5
moveEffectEnabled: true
openEffectEnabled: false
closeEffectEnabled: false
moveWobble: true
resizeWobble: true

slide:

screenshot:

minimizeanimation:

desktopgrid:
zoomDuration: 300
border: 10
desktopNameAlignment: 0
layoutMode: 0
customLayoutRows: 2
usePresentWindows: true

colorpicker:

presentwindows:
layoutMode: 0
showCaptions: true
showIcons: true
doNotCloseWindows: false
ignoreMinimized: false
accuracy: 20
fillGaps: true
fadeDuration: 150
showPanel: false
leftButtonWindow: 1
rightButtonWindow: 2
middleButtonWindow: 0
leftButtonDesktop: 2
middleButtonDesktop: 0
rightButtonDesktop: 0

highlightwindow:

blur:

contrast:

startupfeedback:
type: 1

screenedge:

kscreen:

According to the debug output everything should work. If it doesn't you need to report the regression to the driver vendor.

(In reply to Martin Flöser from comment #1)
> Please provide the output of qdbus org.kde.KWin /KWin supportInformation
> when the problem is visible.

I forced kwin to start using: kwin --replace

So I got the required info:

$ qdbus org.kde.KWin /KWin
method Q_NOREPLY void org.kde.KWin.cascadeDesktop()
method int org.kde.KWin.currentDesktop()
method Q_NOREPLY void org.kde.KWin.killWindow()
method void org.kde.KWin.nextDesktop()
method void org.kde.KWin.previousDesktop()
method Q_NOREPLY void org.kde.KWin.reconfigure()
signal void org.kde.KWin.reloadConfig()
method bool org.kde.KWin.setCurrentDesktop(int desktop)
method void org.kde.KWin.showDebugConsole()
method bool org.kde.KWin.startActivity(QString)
method bool org.kde.KWin.stopActivity(QString)
method QString org.kde.KWin.supportInformation()
method Q_NOREPLY void org.kde.KWin.unclutterDesktop()
method QDBusVariant org.freedesktop.DBus.Properties.Get(QString interface_name, QString property_name)
method QVariantMap org.freedesktop.DBus.Properties.GetAll(QString interface_name)
signal void org.freedesktop.DBus.Properties.PropertiesChanged(QString interface_name, QVariantMap changed_properties, QStringList invalidated_properties)
method void org.freedesktop.DBus.Properties.Set(QString interface_name, QString property_name, QDBusVariant value)
method QString org.freedesktop.DBus.Introspectable.Introspect()
method QString org.freedesktop.DBus.Peer.GetMachineId()
method void org.freedesktop.DBus.Peer.Ping()

Transparency stills not working.  Even yakuke screen doesn't show once called (via f12).  But apparently it is there (applications supposed to be below shows grayed buttons).

When I use <alt>+<mouse-1> to drag konsole, it gets fully transparent.

Created attachment 112851 [details]
Default view (no transparency).

Created attachment 112852 [details]
Transparency forced to 100%

Created attachment 112853 [details]
Whole windows gets transparency on dragging with mouse

(In reply to Martin Flöser from comment #8)
> According to the debug output everything should work. If it doesn't you need
> to report the regression to the driver vendor.

Both vendors (Intel and AMDGPU) are mesa.  This is mesa 18.1.  Other transparencies (i.e., window decorations) - just the transparency effect and transparency during window move.

In any case, an update to qt5-script seems to have fixed it.  The drivers did not update, so it would not appear to have been a driver problem.

Should read - other transparencies work, just not the effects.  Updating qt5-script fixed it.

Helio, does an update of qtscript also fix it for you?

(In reply to Martin Flöser from comment #15)
> Helio, does an update of qtscript also fix it for you?

How do I do that?  I checked and have qt[4,5]-scripts installed.

root@elxaf7qtt32:bin# dpkg -l | grep -i "qt5*script"
ii  libqt5script5:amd64                             5.6.1+dfsg-2build1~~xenialoverlay1~3                                amd64        Qt 5 script module
ii  libqt5scripttools5:amd64                        5.6.1+dfsg-2build1~~xenialoverlay1~3                                amd64        Qt 5 script tools module
ii  libqtscript4-core:amd64                         0.2.0-1                                                             amd64        QtScript bindings for the Qt 4 Core library
ii  libqtscript4-gui:amd64                          0.2.0-1                                                             amd64        QtScript bindings for the Qt 4 Gui library
ii  libqtscript4-network:amd64                      0.2.0-1                                                             amd64        QtScript bindings for the Qt 4 Network library
ii  libqtscript4-opengl:amd64                       0.2.0-1                                                             amd64        QtScript bindings for the Qt 4 OpenGL library
ii  libqtscript4-phonon:amd64                       0.2.0-1                                                             amd64        QtScript bindings for the Qt 4 Phonon library
ii  libqtscript4-qtbindings:amd64                   0.2.0-1                                                             amd64        QtScript bindings for Qt 4 - metapackage
ii  libqtscript4-sql:amd64                          0.2.0-1                                                             amd64        QtScript bindings for the Qt 4 SQL library
ii  libqtscript4-svg:amd64                          0.2.0-1                                                             amd64        QtScript bindings for the Qt 4 SVG library
ii  libqtscript4-uitools:amd64                      0.2.0-1                                                             amd64        QtScript bindings for the Qt 4 UiTools library
ii  libqtscript4-webkit:amd64                       0.2.0-1                                                             amd64        QtScript bindings for the Qt 4 WebKit library
ii  libqtscript4-xml:amd64                          0.2.0-1                                                             amd64        QtScript bindings for the Qt 4 XML library
ii  libqtscript4-xmlpatterns:amd64                  0.2.0-1                                                             amd64        QtScript bindings for the Qt 4 XML patterns library
ii  qtscript-tools                                  0.2.0-1                                                             amd64        tools for QtScript developers
ii  qtscript5-dev:amd64                             5.6.1+dfsg-2build1~~xenialoverlay1~3                                amd64        Qt 5 script development files

(In reply to Martin Flöser from comment #15)
> Helio, does an update of qtscript also fix it for you?

My output was quite terrible.  Here it goes again, formatted:

# dpkg -l | grep -i "qt5*script" | awk '{print $2"_"$3}'
libqt5script5:amd64_5.6.1+dfsg-2build1~~xenialoverlay1~3
libqt5scripttools5:amd64_5.6.1+dfsg-2build1~~xenialoverlay1~3
libqtscript4-core:amd64_0.2.0-1
libqtscript4-gui:amd64_0.2.0-1
libqtscript4-network:amd64_0.2.0-1
libqtscript4-opengl:amd64_0.2.0-1
libqtscript4-phonon:amd64_0.2.0-1
libqtscript4-qtbindings:amd64_0.2.0-1
libqtscript4-sql:amd64_0.2.0-1
libqtscript4-svg:amd64_0.2.0-1
libqtscript4-uitools:amd64_0.2.0-1
libqtscript4-webkit:amd64_0.2.0-1
libqtscript4-xml:amd64_0.2.0-1
libqtscript4-xmlpatterns:amd64_0.2.0-1
qtscript-tools_0.2.0-1
qtscript5-dev:amd64_5.6.1+dfsg-2build1~~xenialoverlay1~3

Can't reproduce on my laptop with an intel gpu. If you can still reproduce it, please report this issue to your gpu driver developers.