Your message dated Thu, 6 Nov 2025 18:10:28 -0500
with message-id 
<CAAajCMbEGeU1s25jpEe8X6shc3ORJcSDUw=so-RFXNkWy=d...@mail.gmail.com>
and subject line closing ancient gdm3 bugs
has caused the Debian Bug report #800327,
regarding gdm3: greeter does not start on nvidia
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
800327: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=800327
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: gdm3
Version: 3.14.2-2
Severity: important

After a recent update, the greeter for gdm3 does not start anymore. Instead the
infamous 'Oh no something went wrong" is displayed, with a "Logout" button that
cycles back to that same error page.

When I configure automatic login, I get a working session, so gnome-session
appears to be working correctly.

I did some debugging, and found out that /usr/lib/gnome-session/gnome-session-
check-accelerated-helper fails. I ran the program under strace as user Debian-
gdm and noticed the following :

stat("/dev/nvidiactl", {st_mode=S_IFCHR|0660, st_rdev=makedev(195, 255), ...})
= 0
open("/dev/nvidiactl", O_RDWR)          = -1 EACCES (Permission denied)


So it looks like that device is not accessible for user Debian-gdm

$ ls -l /dev/nvidiactl
crw-rw---- 1 root video 195, 255 Sep 27 21:16 /dev/nvidiactl
$ groups Debian-gdm
Debian-gdm : Debian-gdm


Adding the user Debian-gdm to group video fixes the problem.



-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.2.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gdm3 depends on:
ii  accountsservice                       0.6.40-3
ii  adduser                               3.113+nmu3
ii  dconf-cli                             0.24.0-2
ii  dconf-gsettings-backend               0.24.0-2
ii  debconf [debconf-2.0]                 1.5.57
ii  gir1.2-gdm3                           3.14.2-2
ii  gnome-session [x-session-manager]     3.16.0-1
ii  gnome-session-bin                     3.16.0-1
ii  gnome-settings-daemon                 3.16.3-1
ii  gnome-shell                           3.16.3-2
ii  gnome-terminal [x-terminal-emulator]  3.18.0-1
ii  gsettings-desktop-schemas             3.18.0-1
ii  libaccountsservice0                   0.6.40-3
ii  libaudit1                             1:2.4.4-3+b1
ii  libc6                                 2.19-22
ii  libcanberra-gtk3-0                    0.30-2.1
ii  libcanberra0                          0.30-2.1
ii  libgdk-pixbuf2.0-0                    2.32.0-1
ii  libgdm1                               3.14.2-2
ii  libglib2.0-0                          2.46.0-1
ii  libglib2.0-bin                        2.46.0-1
ii  libgtk-3-0                            3.16.6-1
ii  libpam-modules                        1.1.8-3.1
ii  libpam-runtime                        1.1.8-3.1
ii  libpam-systemd                        226-3
ii  libpam0g                              1.1.8-3.1
ii  librsvg2-common                       2.40.10-1
ii  libselinux1                           2.3-2+b1
ii  libsystemd0                           226-3
ii  libwrap0                              7.6.q-25
ii  libx11-6                              2:1.6.3-1
ii  libxau6                               1:1.0.8-1
ii  libxdmcp6                             1:1.1.2-1
ii  libxrandr2                            2:1.5.0-1
ii  lsb-base                              9.20150917
ii  metacity [x-window-manager]           1:3.17.2-4
ii  mutter [x-window-manager]             3.16.3-1
ii  policykit-1                           0.105-12
ii  tinywm [x-window-manager]             1.3-9
ii  twm [x-window-manager]                1:1.0.9-1
ii  ucf                                   3.0030
ii  x11-common                            1:7.7+9
ii  x11-xserver-utils                     7.7+5
ii  xterm [x-terminal-emulator]           320-1

Versions of packages gdm3 recommends:
ii  at-spi2-core               2.16.0-1
ii  desktop-base               8.0.2
ii  gnome-icon-theme           3.12.0-1
ii  gnome-icon-theme-symbolic  3.12.0-1
ii  x11-xkb-utils              7.7+2
ii  xserver-xephyr             2:1.17.2-1.1
ii  xserver-xorg               1:7.7+9
ii  zenity                     3.18.0-1

Versions of packages gdm3 suggests:
ii  gnome-orca            3.16.2-2
ii  libpam-gnome-keyring  3.16.0-4

-- debconf information:
  gdm3/daemon_name: /usr/sbin/gdm3
* shared/default-x-display-manager: gdm3

--- End Message ---
--- Begin Message ---
There have been many changes to Debian since this bug was originally
reported. If you are still experiencing this issue with Debian 13 (or
with Debian 12 or Testing or Unstable), please report a new bug.

Thank you,
Jeremy BĂ­cha

--- End Message ---

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