Thanks Tolga. It looks like the root cause of the issue on your machine is a lack of display bandwidth when trying to drive 2 screens through the same cable:
May 11 21:08:51 messier32 kernel: i915 0000:00:02.0: [drm:intel_dp_mst_compute_config [i915]] Trying to find VCPI slots in DSC mode May 11 21:08:51 messier32 kernel: i915 0000:00:02.0: [drm:intel_dp_mst_compute_config [i915]] DSC Source supported min bpp 18 max bpp 24 May 11 21:08:51 messier32 kernel: i915 0000:00:02.0: [drm:intel_dp_mst_compute_config [i915]] DSC Sink supported min bpp 0 max bpp 0 May 11 21:08:51 messier32 kernel: i915 0000:00:02.0: [drm:intel_dp_mst_find_vcpi_slots_for_bpp.constprop.0.isra.0 [i915]] failed finding vcpi slots:-22 May 11 21:08:51 messier32 kernel: i915 0000:00:02.0: [drm:intel_atomic_check [i915]] [ENCODER:106:DP-MST C] config failure: -22 I'm not sure if that's an "expected" or "normal" error which we should expect to see on some setups forever, or if it's a kernel bug. If it's "expected" then ideally mutter/gnome-shell should fail more gracefully but I don't know how that's possible given how limited the atomic API is. You can never find out _what_ failed, only that something failed. I hate atomic KMS. Did the workaround work for you? MUTTER_DEBUG_ENABLE_ATOMIC_KMS=0 MUTTER_DEBUG_FORCE_KMS_MODE=simple in /etc/environment -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-hwe-5.19 in Ubuntu. https://bugs.launchpad.net/bugs/1968040 Title: [i915] Blanked screen doesn't wake up after locking [drmModeAtomicCommit: Argument invalide] [drmModeAtomicCommit: Invalid argument] Status in GNOME Shell: New Status in Mutter: New Status in linux package in Ubuntu: Confirmed Status in linux-hwe-5.19 package in Ubuntu: Confirmed Status in mutter package in Ubuntu: Confirmed Bug description: [ Workaround ] Add to /etc/environment (in Ubuntu 22.04): MUTTER_DEBUG_ENABLE_ATOMIC_KMS=0 or in Ubuntu 22.10 and later: MUTTER_DEBUG_FORCE_KMS_MODE=simple and then reboot. [ Upstream bugs ] https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5098 https://gitlab.gnome.org/GNOME/mutter/-/issues/2268 https://gitlab.gnome.org/GNOME/mutter/-/issues/2749 [ Original report ] (initially reported as a comment on bug #1965085, and split into a separate bug report) After I lock my screen and let it blank, moving the mouse or pressing any key on the keyboard won't wake it up. The only reliable workaround I've found is to press Ctrl+Alt+F1. That's on a fully up-to-date jammy, my hardware is an Intel NUC with a single Samsung monitor connected with a standard HDMI cable. This is a regression that started happening yesterday (2022-04-05) if I can remember correctly (I do apply pending updates at least once daily). ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: gdm3 42.0-1ubuntu2 ProcVersionSignature: Ubuntu 5.15.0-25.25-generic 5.15.30 Uname: Linux 5.15.0-25-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu80 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Wed Apr 6 15:19:30 2022 InstallationDate: Installed on 2020-09-16 (566 days ago) InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Alpha amd64 (20200910) SourcePackage: gdm3 UpgradeStatus: Upgraded to jammy on 2022-03-19 (17 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-shell/+bug/1968040/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
