On Fri, 14 Nov 2025 19:31:58 -0600 "Brent S. Elmer, Ph.D." <[email protected]> wrote: > On Thu, 2025-11-13 at 09:57 +0000, Simon McVittie wrote: > > Control: tags -1 + moreinfo > > > > On Wed, 12 Nov 2025 at 21:38:29 -0600, Brent wrote: > > > gdm3 fails to start after upgrading. I get the black screen with a > > > blinking > > > cursor in the top left corner. > > > > We will need more information than this: the same upgrade has worked > > successfully for others. Please check the systemd Journal for log > > messages that occur during the failed startup. > > Including the journal for the failed boot using the official debian > kernel 6.12.48+deb13-amd64. journalctl.txt > > > > > Kernel: Linux 6.12.48251025 (SMP w/2 CPU threads; PREEMPT) > > > Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_WARN, > > > TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE > > > > This doesn't look like an official Debian kernel, so one possible > > cause > > is if your (presumably locally-built) kernel doesn't support a > > required > > feature. > > Tried using debian official kernel 6.12.48+deb13-amd64. Did not make > any difference. > > > > > Is that proprietary/out-of-tree module a version of the Nvidia > > proprietary driver? If yes, what version? > > > > Yes it is the proprietary nvidia module version 550.163.01-3 > > > > /etc/gdm3/daemon.conf changed: > > > [daemon] > > > WaylandEnable=false > The journalctl.txt included is with WaylandEnable=false > > journalctl_new.txt is with WaylandEnable=false commented out. > This got a little farther as gdm actually started and let me attempt to > login. After entering userid and password I got a blank screen and the > screen came back to the login screen. If I try to login again it said > someone was already logged in. Gnome never starts. > > > > GNOME 49 only supports Wayland sessions. gdm3 can still launch X11 > > sessions as the session you log in to (tested with cinnamon), but the > > gdm3 greeter (the login prompt) is now always a Wayland session, and > > so > > is a GNOME login session. > > > > smcv
I was experiencing the same issue, using everyone's favorite graphics drivers (Nvidia) and followed the steps in https://wiki.debian.org/NvidiaGraphicsDrivers#wayland-modesetting to get Wayland and my desktop working again. I recommend you try the same to see if this bug should stay open. -- Dan Chokola
