*** If you're not sure this is actually a bug, instead post about it at https://discuss.kde.org If you're reporting a crash, attach a backtrace with debug symbols; see https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** SUMMARY STEPS TO REPRODUCE 1. turn on two monitors {Samsung OdysseuG952xUHD , projektor Optoma UHD 4k} 2. power on PC 3. hangs OBSERVED RESULT with only one monitor it is working, doesn't matter which one the problem showed after few latest upgrades by system EXPECTED RESULT SOFTWARE/OS VERSIONS Linux/KDE Plasma: 6.1.2 KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION OS: KDE neon 6.0 x86_64 `:/: `.----//----.` :/- Host: Z370 AORUS Ultra Gaming .:. `---` `--.` .:` Kernel: 6.5.0-41-generic .:` `--` .:- `:. Uptime: 1 hour, 38 mins `/ `:. `.-::-.` -:` `/` Packages: 2320 (dpkg), 25 (flatpak), 12 (snap) /. /. `:++++++++:` .: .: Shell: bash 5.1.16 `/ .: `+++++++++++/ /` `+` Resolution: 7680x2160 /+` -- .++++++++++++` :. .+: DE: Plasma 6.1.2 `/ .: `+++++++++++/ /` `+` WM: kwin /` /. `:++++++++:` .: .: Theme: Breeze [GTK2/3] ./ `:. `.:::-.` -:` `/` Icons: breeze-dark [GTK2/3] .:` `--` .:- `:. Terminal: konsole .:. `---` `--.` .:` CPU: Intel i7-8700K (12) @ 4.700GHz `:/: `.----//----.` :/- GPU: AMD ATI 03:00.0 Device 744c .-:.` `` `-:-. Memory: 6449MiB / 64106MiB Debug >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> čec 04 13:32:08 DESK-LX kernel: CPU: 9 PID: 9434 Comm: kworker/9:1H Tainted: G W OE 6.5.0-41-generic #41~22.04.2-Ubuntu čec 04 13:32:08 DESK-LX kernel: Hardware name: Gigabyte Technology Co., Ltd. Z370 AORUS Ultra Gaming/Z370 AORUS Ultra Gaming-CF, BIOS F15 08/13/2019 čec 04 13:32:08 DESK-LX kernel: Workqueue: events_highpri dm_irq_work_func [amdgpu] čec 04 13:32:08 DESK-LX kernel: RIP: 0010:fill_dc_mst_payload_table_from_drm+0xb7/0x250 [amdgpu] čec 04 13:32:08 DESK-LX kernel: Code: fe 06 0f 87 1f 01 00 00 0f b6 7a 09 41 38 7d 00 75 dd 0f b7 0d 12 a5 af 00 4b 8d 14 76 66 89 8c d5 50 ff ff ff 41 39 df 75 31 <0f> 0b eb 2d 49 83 ff 06 0f 87 53 01 00 00 0f b7 0d ec a4 af 00 8a čec 04 13:32:08 DESK-LX kernel: RSP: 0018:ffffbe279045f538 EFLAGS: 00010246 čec 04 13:32:08 DESK-LX kernel: RAX: ffffbe279045f6d0 RBX: 0000000000000000 RCX: 0000000000000000 čec 04 13:32:08 DESK-LX kernel: RDX: ffffbe279045f638 RSI: ffff9d541f760bb0 RDI: ffffbe279045f5f0 čec 04 13:32:08 DESK-LX kernel: RBP: ffffbe279045f620 R08: ffff9d541f760800 R09: 0000000000000000 čec 04 13:32:08 DESK-LX kernel: R10: 0000000000000000 R11: 0000000000000000 R12: ffffbe279045f570 čec 04 13:32:08 DESK-LX kernel: R13: ffffbe279045f570 R14: ffffbe279045f638 R15: 0000000000000000 čec 04 13:32:08 DESK-LX kernel: FS: 0000000000000000(0000) GS:ffff9d6305e40000(0000) knlGS:0000000000000000 čec 04 13:32:08 DESK-LX kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 čec 04 13:32:08 DESK-LX kernel: CR2: 0000050f03186000 CR3: 0000000cce23a004 CR4: 00000000003706e0 čec 04 13:32:08 DESK-LX kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 čec 04 13:32:08 DESK-LX kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 čec 04 13:32:08 DESK-LX kernel: Call Trace: čec 04 13:32:08 DESK-LX kernel: <TASK> čec 04 13:32:08 DESK-LX kernel: ? show_regs+0x6d/0x80 čec 04 13:32:08 DESK-LX kernel: ? __warn+0x89/0x160 čec 04 13:32:08 DESK-LX kernel: ? fill_dc_mst_payload_table_from_drm+0xb7/0x250 [amdgpu] čec 04 13:32:08 DESK-LX kernel: ? report_bug+0x17e/0x1b0 čec 04 13:32:08 DESK-LX kernel: ? handle_bug+0x46/0x90 čec 04 13:32:08 DESK-LX kernel: ? exc_invalid_op+0x18/0x80 čec 04 13:32:08 DESK-LX kernel: ? asm_exc_invalid_op+0x1b/0x20 čec 04 13:32:08 DESK-LX kernel: ? fill_dc_mst_payload_table_from_drm+0xb7/0x250 [amdgpu] čec 04 13:32:08 DESK-LX kernel: dm_helpers_dp_mst_write_payload_allocation_table+0xda/0x130 [amdgpu] čec 04 13:32:08 DESK-LX kernel: deallocate_mst_payload_with_temp_drm_wa.isra.0+0xb0/0x2c0 [amdgpu] čec 04 13:32:08 DESK-LX kernel: deallocate_mst_payload.isra.0+0x325/0x550 [amdgpu] čec 04 13:32:08 DESK-LX kernel: link_set_dpms_off+0x234/0x390 [amdgpu] čec 04 13:32:08 DESK-LX kernel: ? optc3_lock+0x97/0x110 [amdgpu] čec 04 13:32:08 DESK-LX kernel: commit_planes_do_stream_update+0x333/0x760 [amdgpu] čec 04 13:32:08 DESK-LX kernel: commit_planes_for_stream+0x2fa/0x14e0 [amdgpu] čec 04 13:32:08 DESK-LX kernel: ? update_planes_and_stream_state+0x337/0x460 [amdgpu] čec 04 13:32:08 DESK-LX kernel: dc_update_planes_and_stream+0x200/0x780 [amdgpu] čec 04 13:32:08 DESK-LX kernel: ? dce_aux_transfer_raw+0x1c4/0x2e0 [amdgpu] čec 04 13:32:08 DESK-LX kernel: dc_commit_updates_for_stream+0x53c/0x720 [amdgpu] čec 04 13:32:08 DESK-LX kernel: ? core_link_read_dpcd+0x164/0x230 [amdgpu] čec 04 13:32:08 DESK-LX kernel: link_set_all_streams_dpms_off_for_link+0xe4/0x180 [amdgpu] čec 04 13:32:08 DESK-LX kernel: verify_link_capability.isra.0+0x260/0x300 [amdgpu] čec 04 13:32:08 DESK-LX kernel: link_detect+0x39/0x260 [amdgpu] čec 04 13:32:08 DESK-LX kernel: dc_link_detect+0x1d/0x30 [amdgpu] čec 04 13:32:08 DESK-LX kernel: handle_hpd_irq_helper+0x122/0x1a0 [amdgpu] čec 04 13:32:08 DESK-LX kernel: handle_hpd_irq+0xe/0x20 [amdgpu] čec 04 13:32:08 DESK-LX kernel: dm_irq_work_func+0x16/0x30 [amdgpu] čec 04 13:32:08 DESK-LX kernel: process_one_work+0x23d/0x450 čec 04 13:32:08 DESK-LX kernel: worker_thread+0x50/0x3f0 čec 04 13:32:08 DESK-LX kernel: ? __pfx_worker_thread+0x10/0x10 čec 04 13:32:08 DESK-LX kernel: kthread+0xef/0x120 čec 04 13:32:08 DESK-LX kernel: ? __pfx_kthread+0x10/0x10 čec 04 13:32:08 DESK-LX kernel: ret_from_fork+0x44/0x70 čec 04 13:32:08 DESK-LX kernel: ? __pfx_kthread+0x10/0x10 čec 04 13:32:08 DESK-LX kernel: ret_from_fork_asm+0x1b/0x30 čec 04 13:32:08 DESK-LX kernel: </TASK> čec 04 13:32:08 DESK-LX kernel: ---[ end trace 0000000000000000 ]--- čec 04 13:32:08 DESK-LX kernel: [drm] DM_MST: starting TM on aconnector: 000000000405bd48 [id: 83] čec 04 13:32:08 DESK-LX kernel: [drm] DM_MST: DP14, 4-lane link detected čec 04 13:32:12 DESK-LX kwin_wayland[1369]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug čec 04 13:32:17 DESK-LX kwin_wayland[1369]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug čec 04 13:32:18 DESK-LX kernel: amdgpu 0000:03:00.0: [drm] *ERROR* [CRTC:72:crtc-0] flip_done timed out čec 04 13:32:22 DESK-LX kwin_wayland[1369]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug čec 04 13:32:24 DESK-LX kernel: [drm] DM_MST: stopping TM on aconnector: 000000000405bd48 [id: 83] čec 04 13:32:24 DESK-LX kernel: workqueue: dm_irq_work_func [amdgpu] hogged CPU for >10000us 4 times, consider switching to WQ_UNBOUND čec 04 13:32:24 DESK-LX kernel: [drm] DM_MST: starting TM on aconnector: 000000000405bd48 [id: 83] čec 04 13:32:24 DESK-LX kernel: [drm] DM_MST: DP14, 4-lane link detected čec 04 13:32:27 DESK-LX kwin_wayland[1369]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug čec 04 13:32:32 DESK-LX kwin_wayland[1369]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug čec 04 13:32:37 DESK-LX kwin_wayland[1369]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug čec 04 13:32:37 DESK-LX kwin_wayland[1369]: kwin_wayland_drm: No drm events for gpu "/dev/dri/card0" within last 30 seconds čec 04 13:32:38 DESK-LX kernel: [drm] Downstream port present 0, type 0 čec 04 13:32:38 DESK-LX kwin_wayland[1369]: kwin_wayland_drm: failed to open drm device at "" čec 04 13:32:38 DESK-LX kwin_wayland[1369]: kwin_wayland_drm: failed to open drm device at "" čec 04 13:32:38 DESK-LX kwin_wayland[1369]: kwin_wayland_drm: failed to open drm device at "" čec 04 13:32:38 DESK-LX kwin_wayland[1369]: kwin_wayland_drm: failed to open drm device at "" čec 04 13:32:42 DESK-LX kwin_wayland[1369]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug čec 04 13:32:43 DESK-LX systemd-logind[941]: Power key pressed. čec 04 13:32:47 DESK-LX kwin_wayland[1369]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug čec 04 13:32:48 DESK-LX kernel: amdgpu 0000:03:00.0: [drm] *ERROR* flip_done timed out čec 04 13:32:48 DESK-LX kernel: amdgpu 0000:03:00.0: [drm] *ERROR* [CRTC:72:crtc-0] commit wait timed out čec 04 13:32:52 DESK-LX kwin_wayland[1369]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug -- Boot 5831baf9f1f245b5ac6312734cd7aaba -- #################################################
forget point the debug info, basically the lines cca 1 minute before 13:32:43 DESK-LX systemd-logind[941]: Power key pressed.
About the pageflips, see also bug #493754