Daniel I am debugging a similar issue on vmwgfx with software rendering and seeing the following. I think your theory about mastership may be vaild as I am seeing an EACCESS before switching to Xorg.
Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: Assigning buffer to primary plane update on CRTC (43) with src rect 0.000000,0.000000 1904.000000x929.000000 and dst rect 0,0 1904x929 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: Posting primary plane composite update for CRTC 43 (/dev/dri/card0) Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Processing update Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Assigning cursor plane (37, /dev/dri/card0) to 110, 64x64+0+0 -> 64x64+885+607 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 37 (/dev/dri/card0) property 'FB_ID' (17) to 110 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 37 (/dev/dri/card0) property 'CRTC_ID' (20) to 43 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 37 (/dev/dri/card0) property 'SRC_X' (9) to 0.00 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 37 (/dev/dri/card0) property 'SRC_Y' (10) to 0.00 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 37 (/dev/dri/card0) property 'SRC_W' (11) to 64.00 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 37 (/dev/dri/card0) property 'SRC_H' (12) to 64.00 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 37 (/dev/dri/card0) property 'CRTC_X' (13) to 885 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 37 (/dev/dri/card0) property 'CRTC_Y' (14) to 607 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 37 (/dev/dri/card0) property 'CRTC_W' (15) to 64 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 37 (/dev/dri/card0) property 'CRTC_H' (16) to 64 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 37 (/dev/dri/card0) property 'HOTSPOT_X' (38) to 4 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 37 (/dev/dri/card0) property 'HOTSPOT_Y' (39) to 4 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Assigning primary plane (35, /dev/dri/card0) to 109, 1904x929+0+0 -> 1904x929+0+0 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 35 (/dev/dri/card0) property 'FB_ID' (17) to 109 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 35 (/dev/dri/card0) property 'CRTC_ID' (20) to 43 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 35 (/dev/dri/card0) property 'SRC_X' (9) to 0.00 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 35 (/dev/dri/card0) property 'SRC_Y' (10) to 0.00 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 35 (/dev/dri/card0) property 'SRC_W' (11) to 1904.00 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 35 (/dev/dri/card0) property 'SRC_H' (12) to 929.00 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 35 (/dev/dri/card0) property 'CRTC_X' (13) to 0 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 35 (/dev/dri/card0) property 'CRTC_Y' (14) to 0 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 35 (/dev/dri/card0) property 'CRTC_W' (15) to 1904 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Setting plane 35 (/dev/dri/card0) property 'CRTC_H' (16) to 929 Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] Committing update flags: ATOMIC_NONBLOCK|PAGE_FLIP_EVENT Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: KMS: [atomic] KMS update failed: drmModeAtomicCommit: Permission denied Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: BACKEND: Releasing device file '/dev/input/event0' Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: BACKEND: Releasing control of and closing device file '/dev/input/event0' Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: BACKEND: Releasing device file '/dev/input/event3' Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: BACKEND: Releasing control of and closing device file '/dev/input/event3' Apr 17 11:33:17 ubuntu2410 gnome-shell[1776]: BACKEND: Releasing device file '/dev/dri/card0' Apr 17 11:33:18 ubuntu2410 gnome-shell[2748]: Running GNOME Shell (using mutter 47.0) as a X11 window and compositing manager The display comes back at the lock screen after the sleep timeout with the message Apr 17 12:09:03 ubuntu2410 gnome-shell[6410]: [WINSYS] ../cogl/cogl/winsys/cogl-onscreen-glx.c:282: MakeContextCurrent dpy: 0x62512e9666f0, window: 0x200009, context: 0x62512e9ef950 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/2089709 Title: Ubuntu 24.04 sometimes logs in to a black screen if the mouse is moved during login To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/2089709/+subscriptions -- desktop-bugs mailing list 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