Created attachment 160088 [details] example of graphic artifact SUMMARY plasma-systemmonitor is poorly usable due to graphical artefacts when running with nouveau kernel module . The artifact affects the process tables and the menus of the program, expecially when the mouse pointer hovers on them. This issue appeared on a Debian Bookworm (12.0) installation and wasn't present with previous Debian version. A bug report has been opened in the Debian Bug Tracking System: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1040234 STEPS TO REPRODUCE 1. start plasma-systemmonitor from the KDE menu or from the command line, 2. display process table and/or select items from program menu. OBSERVED RESULT KDE's plasma-systemmonitor (KDE's system monitor) shows graphical artefacts and this makes the application poorly usable. The artefacts are more more visible when the mouse hovers on a list of items (for example, the list of running processes or a list of items in the program's menu (screenshot attached). The nouveau kernel module continuously reports the following same error messages (in kernel's log) as long as plasma-systemmonitor is running: -------------8<-------------8<-------------8<-------------8<-------------8< lug 03 09:20:39 debian kernel: nouveau 0000:01:00.0: gr: TRAP_MP - TP0:00000010 [LOCAL_LIMIT_WRITE] lug 03 09:20:39 debian kernel: nouveau 0000:01:00.0: gr: TRAP_MP - TP1:00000010 [LOCAL_LIMIT_WRITE] lug 03 09:20:39 debian kernel: nouveau 0000:01:00.0: gr: TRAP_PROP - TP 0 - Unknown CUDA fault at address 00201a3800 lug 03 09:20:39 debian kernel: nouveau 0000:01:00.0: gr: TRAP_PROP - TP 0 - e0c: 00000000, e18: 00000f02, e1c: 00000000, e20: 00000000, e24: 09030000 lug 03 09:20:39 debian kernel: nouveau 0000:01:00.0: gr: TRAP_PROP - TP 1 - Unknown CUDA fault at address 00201a9100 lug 03 09:20:39 debian kernel: nouveau 0000:01:00.0: gr: TRAP_PROP - TP 1 - e0c: 00000000, e18: 00000ff2, e1c: 00000000, e20: 00000000, e24: 09030000 lug 03 09:20:39 debian kernel: nouveau 0000:01:00.0: gr: 00200000 [] ch 16 [001e4c6000 Xorg[787]] subc 3 class 8297 mthd 15e0 data 00000000 lug 03 09:20:39 debian kernel: nouveau 0000:01:00.0: fb: trapped write at 00201a3800 on channel 16 [1e4c6000 Xorg[787]] engine 00 [PGRAPH] client 0b [PROP] subclient 09 [LOCAL] reason 00000002 [PAGE_NOT_PRESENT] -------------8<-------------8<-------------8<-------------8<-------------8< The overall graphical performance of the system during the issue is affected when plasma-systemmonitor is running, too. When plasma-systemmonitor is stopped, the graphical performance returns normal and the nouveau kernel module stops generating error messages in kernel's log. It seems that plasma-systemmonitor is triggering a malfunction in the graphical stack (detected by nouveau kernel module) and the graphic artefacts are a consequence of it. The plasma-systemmonitor distributed with Debian Bookworm uses Qt5 QML. QML should make use of GPU acceleration, unlike in the system monitor distributed with previous versions of KDE. Some reports have previously shown similar issues. The issue disappears if run plasma-systemmonitor runs from command line disabling the hardware acceleration by Mesa 3D with the following command that forces software rendering: $ LIBGL_ALWAYS_SOFTWARE=1 plasma-systemmonitor note: the artefacts appear also if Debian Bookworm (12.0) is booted with the linux kernel version (5.10.165) used in the previous Debian release (that was not affected by hte issue because it was using a previous and older version of the KDE system monitor). Therefore, the issue is probably triggered by something in user space. EXPECTED RESULT I would expect plasma-systemmonitor to be running out of the box (with graphical acceleration from nouveau kernel module) without graphical artefacts. SOFTWARE/OS VERSIONS Linux/KDE Plasma: The KDE "about" information is: Operating System: Debian GNU/Linux 12 KDE Plasma Version: 5.27.5 KDE Frameworks Version: 5.103.0 Qt Version: 5.15.8 Kernel Version: 6.1.0-9-amd64 (64-bit) Graphics Platform: X11 Processors: 2 × Intel® Core™2 Duo CPU P8400 @ 2.26GHz Memory: 2.9 GiB of RAM Graphics Processor: NV96 Manufacturer: Acer Product Name: Aspire 5930 System Version: 0100 ADDITIONAL INFORMATION This are the details about the nvidia graphic card: -------------8<-------------8<-------------8<-------------8<-------------8< $ inxi -G Graphics: Device-1: NVIDIA G96CM [GeForce 9600M GT] driver: nouveau v: kernel Display: x11 server: X.Org v: 1.21.1.7 with: Xwayland v: 22.1.9 driver: X: loaded: modesetting unloaded: fbdev,vesa dri: nouveau gpu: nouveau resolution: 1280x800~60Hz API: OpenGL v: 3.3 Mesa 22.3.6 renderer: NV96 -------------8<-------------8<-------------8<-------------8<-------------8< -- System Information: Debian Release: 12.0 APT prefers stable-security APT policy: (500, 'stable-security'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 6.1.0-9-amd64 (SMP w/2 CPU threads; PREEMPT) Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:it_IT Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages plasma-systemmonitor depends on: ii ksystemstats 5.27.5-2 ii libc6 2.36-9 ii libkf5configcore5 5.103.0-2 ii libkf5configgui5 5.103.0-2 ii libkf5coreaddons5 5.103.0-1 ii libkf5dbusaddons5 5.103.0-1 ii libkf5globalaccel-bin 5.103.0-1 ii libkf5globalaccel5 5.103.0-1 ii libkf5i18n5 5.103.0-1 ii libkf5itemmodels5 5.103.0-1 ii libkf5kiogui5 5.103.0-1 ii libkf5newstuffcore5 5.103.0-1 ii libkf5service-bin 5.103.0-1 ii libkf5service5 5.103.0-1 ii libkf5windowsystem5 5.103.0-1 ii libksysguardsensorfaces1 4:5.27.5-2 ii libqt5core5a 5.15.8+dfsg-11 ii libqt5dbus5 5.15.8+dfsg-11 ii libqt5gui5 5.15.8+dfsg-11 ii libqt5qml5 5.15.8+dfsg-3 ii libqt5widgets5 5.15.8+dfsg-11 ii libstdc++6 12.2.0-14 ii qml-module-org-kde-kcm 5.103.0-1 ii qml-module-org-kde-kcoreaddons 5.103.0-1 ii qml-module-org-kde-kirigami2 5.103.0-1 ii qml-module-org-kde-kitemmodels 5.103.0-1 ii qml-module-org-kde-kquickcontrolsaddons 5.103.0-1 ii qml-module-org-kde-ksysguard 4:5.27.5-2 ii qml-module-org-kde-newstuff 5.103.0-1 ii qml-module-org-kde-qqc2desktopstyle 5.103.0-1 ii qml-module-org-kde-quickcharts 5.103.0-1 ii qml-module-qt-labs-platform 5.15.8+dfsg-2 ii qml-module-qt-labs-qmlmodels 5.15.8+dfsg-3 ii qml-module-qtqml 5.15.8+dfsg-3 ii qml-module-qtqml-models2 5.15.8+dfsg-3 ii qml-module-qtquick-controls2 5.15.8+dfsg-2 ii qml-module-qtquick-dialogs 5.15.8-2 ii qml-module-qtquick-layouts 5.15.8+dfsg-3 ii qml-module-qtquick-window2 5.15.8+dfsg-3 ii qml-module-qtquick2 5.15.8+dfsg-3
According to [1], these are further information about OpenGL implementation as viewed from plasma-systemmonitor: -------8<-------8<-------8<-------8<-------8<-------8<-------8< $ QSG_INFO=1 plasma-systemmonitor qt.scenegraph.general: QSG: basic render loop qt.scenegraph.general: Using sg animation driver qt.scenegraph.general: opengl texture atlas dimensions: 2048x1024 qt.scenegraph.general: R/G/B/A Buffers: 8 8 8 0 qt.scenegraph.general: Depth Buffer: 24 qt.scenegraph.general: Stencil Buffer: 8 qt.scenegraph.general: Samples: -1 qt.scenegraph.general: GL_VENDOR: nouveau qt.scenegraph.general: GL_RENDERER: NV96 qt.scenegraph.general: GL_VERSION: 3.3 (Compatibility Profile) Mesa 22.3.6 qt.scenegraph.general: GL_EXTENSIONS: GL_AMD_conservative_depth GL_AMD_performance_monitor 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_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_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_direct_state_access GL_ARB_draw_buffers 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_layer_viewport 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_parallel_shader_compile 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_robustness GL_ARB_sampler_objects GL_ARB_seamless_cube_map GL_ARB_separate_shader_objects GL_ARB_shader_bit_encoding GL_ARB_shader_clock GL_ARB_shader_objects GL_ARB_shader_subroutine 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_include GL_ARB_shading_language_packing GL_ARB_shadow 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_range GL_ARB_texture_compression GL_ARB_texture_compression_bptc GL_ARB_texture_compression_rgtc GL_ARB_texture_cube_map 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_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_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_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_viewport_array 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_EGL_image_storage GL_EXT_EGL_sync 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_debug_label GL_EXT_depth_bounds_test GL_EXT_direct_state_access 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_gpu_shader4 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_clamp GL_EXT_provoking_vertex GL_EXT_rescale_normal GL_EXT_secondary_color 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_buffer_object 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_R8 GL_EXT_texture_sRGB_RG8 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_EXT_window_rectangles GL_IBM_multimode_draw_arrays GL_IBM_rasterpos_clip GL_IBM_texture_mirrored_repeat GL_INGR_blend_func_separate GL_KHR_context_flush_control GL_KHR_debug GL_KHR_no_error GL_KHR_parallel_shader_compile GL_KHR_texture_compression_astc_ldr GL_KHR_texture_compression_astc_sliced_3d 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_ES1_1_compatibility GL_NV_blend_square GL_NV_conditional_render GL_NV_copy_image GL_NV_depth_clamp GL_NV_fog_distance GL_NV_half_float 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 qt.scenegraph.general: Max Texture Size: 8192 qt.scenegraph.general: Debug context: false file:///usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/kirigami.2/templates/InlineMessage.qml:257:13: QML SelectableLabel: Binding loop detected for property "implicitWidth" file:///usr/share/ksysguard/sensorfaces/org.kde.ksysguard.linechart/contents/ui/FullRepresentation.qml:22:1: QML FullRepresentation: Binding loop detected for property "implicitHeight" file:///usr/share/ksysguard/sensorfaces/org.kde.ksysguard.linechart/contents/ui/FullRepresentation.qml:22:1: QML FullRepresentation: Binding loop detected for property "implicitHeight" file:///usr/share/ksysguard/sensorfaces/org.kde.ksysguard.linechart/contents/ui/FullRepresentation.qml:22:1: QML FullRepresentation: Binding loop detected for property "implicitHeight" file:///usr/share/ksysguard/sensorfaces/org.kde.ksysguard.linechart/contents/ui/FullRepresentation.qml:22:1: QML FullRepresentation: Binding loop detected for property "implicitHeight" file:///usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/ksysguard/page/EditablePage.qml?page=overview.page:256:5: QML Loader: Binding loop detected for property "height" file:///usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/kirigami.2/templates/InlineMessage.qml:257:13: QML SelectableLabel: Binding loop detected for property "implicitWidth" file:///usr/share/ksysguard/sensorfaces/org.kde.ksysguard.textonly/contents/ui/GroupedText.qml:98:21: Unable to assign [undefined] to QColor file:///usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/ksysguard/page/PageContents.qml:197:29: Unable to assign [undefined] to bool file:///usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/ksysguard/page/PageContents.qml:197:29: Unable to assign [undefined] to bool file:///usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/ksysguard/page/PageContents.qml:197:29: Unable to assign [undefined] to bool QProcess: Destroyed while process ("/usr/lib/x86_64-linux-gnu/libexec/ksysguard/ksgrd_network_helper") is still running. -------8<-------8<-------8<-------8<-------8<-------8<-------8< ---- [1] https://www.qt.io/blog/2017/01/18/opengl-implementation-qt-quick-app-using-today
Got something similar but also with other apps (plasmashell, so entire session). --- Oct 15 20:05:05 fixe kernel: nouveau 0000:02:00.0: gr: TRAP_PROP - TP 0 - Unknown CUDA fault at address 00201b0800 Oct 15 20:05:05 fixe kernel: nouveau 0000:02:00.0: gr: TRAP_PROP - TP 0 - e0c: 00000000, e18: 00000ff2, e1c: 00000000, e20: 00000000, e24: 09030000 Oct 15 20:05:05 fixe kernel: nouveau 0000:02:00.0: gr: TRAP_PROP - TP 1 - Unknown CUDA fault at address 00201bbc00 Oct 15 20:05:05 fixe kernel: nouveau 0000:02:00.0: gr: TRAP_PROP - TP 1 - e0c: 00000000, e18: 00000ff2, e1c: 00000000, e20: 00000000, e24: 09030000 Oct 15 20:05:05 fixe kernel: nouveau 0000:02:00.0: gr: 00200000 [] ch 12 [001ebee000 plasmashell[2525]] subc 3 class 8297 mthd 15f0 data 01780178 Oct 15 20:05:05 fixe kernel: nouveau 0000:02:00.0: fb: trapped write at 00201b0800 on channel 12 [1ebee000 plasmashell[2525]] engine 00 [PGRAPH] client 0b [PROP] subclient 09 [LOCAL] reason 00000002 [PAGE_NOT_PRESENT] --- The problem appears a few months ago (august), but I did not have the time to check it before (due to a dead mother board in august which has been changed now; I though it was linked… but no). This can lead to random crash (system hang, impossible to do anything, no mouse, no keyboard). Qt: 5.15.10 Framework: 5.110.0 Plasma: 5.27.8 KDE apps: 23.04.3 02:00.0 VGA compatible controller: NVIDIA Corporation G96C [GeForce 9500 GT] (rev a1) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. G96C [GeForce 9500 GT] => with Nouveau driver / kernel 6.1.57
Charts rendered by System Monitor use accelerated rendering through a shader. This shader is somewhat more complex than the usual "transform vertex; output color" that is used for a lot of things in QtQuick. I am not aware of issues with this particular shader, as it works fine (with some caveats) on other drivers. However, using Nouveau it seems this shader triggers a bug that leads to GPU stalls. I would recommend opening an issue on the Nouveau issue tracker, as we can't really do anything here.
I can confirm. Same behavior in plasma-nm/speed charts. The system crashes and the only solution is magic SysRq.
(In reply to luca from comment #4) > I can confirm. > Same behavior in plasma-nm/speed charts. > The system crashes and the only solution is magic SysRq. You are “lucky”. SysRq is not working for me => hard reboot mandatory
Hello, (In reply to Arjen Hiemstra from comment #3) > Charts rendered by System Monitor use accelerated rendering through a > shader. This shader is somewhat more complex than the usual "transform > vertex; output color" that is used for a lot of things in QtQuick. I am not > aware of issues with this particular shader, as it works fine (with some > caveats) on other drivers. However, using Nouveau it seems this shader > triggers a bug that leads to GPU stalls. I would recommend opening an issue > on the Nouveau issue tracker, as we can't really do anything here. Can you point to a simple example program written in KDE or QT that would be able to replicate the issue with the particular type of shader you reported? It could be useful for debugging purposes.
I too have this problem with a NV96 card and plasma-systemmonitor. This problem was always there from the time I installed plasma-systemmonitor v.5.x in June to this day with v.6.0.4. I believe it is related to this: https://lists.freedesktop.org/archives/nouveau/2014-May/017082.html "Problem appear in shaders containing loops with conditional break when loop is not unrolled by nouveau. ... I think that artifacts appear in areas where is big difference in number of iterations executed for pixel before breaking from loop." If this is true, this behavior is really old.