Bazzite fails to boot into Gaming Mode and falls back to Desktop Mode

Bazzite
1

Suddenly my Bazzite instance boots after a while into Desktop Mode and not Gaming Mode anymore. Also trying to “Return to Gaming Mode” from within the Desktop does not work anymore.

rpm-ostree status shows (I also tried to rebase to testing, with still no fix):

user_id@hostname:~$ rpm-ostree status
State: idle
Deployments:
● ostree-unverified-registry:ghcr.io/ublue-os/bazzite-deck-nvidia-gnome:stable
                   Digest: sha256:68f22035371c30e9188e98357df551159c8e712f708d1af2d8a897915f9f9092
                  Version: 42.20250501 (2025-05-01T19:28:49Z)

  ostree-image-signed:docker://ghcr.io/ublue-os/bazzite-deck-nvidia-gnome:testing
                   Digest: sha256:04889ee2c019d08ddd0a30ebe94d6fdb03294be63ed97a08b6c590a760805817
                  Version: testing-42.20250504.2 (2025-05-04T10:56:11Z)

systemctl status bazzite-autologin shows:

user_id@hostname:~$ systemctl status bazzite-autologin
○ bazzite-autologin.service - Enables Bazzite autologin
     Loaded: loaded (/usr/lib/systemd/system/bazzite-autologin.service; enabled; preset: disabled)
    Drop-In: /usr/lib/systemd/system/service.d
             └─10-timeout-abort.conf
     Active: inactive (dead) since Sun 2025-05-04 17:44:23 CEST; 5min ago
 Invocation: 69919d62ffca4a62907ff9387907aaf3
   Main PID: 1410 (code=exited, status=0/SUCCESS)
   Mem peak: 3.3M
        CPU: 11ms

Mai 04 17:44:23 hostname systemd[1]: Starting bazzite-autologin.service - Enables Bazzite autologin...
Mai 04 17:44:23 hostname systemd[1]: bazzite-autologin.service: Deactivated successfully.
Mai 04 17:44:23 hostname systemd[1]: Finished bazzite-autologin.service - Enables Bazzite autologin.

systemctl status sddm shows:

user_id@hostname:~$ systemctl status sddm
● sddm.service - Simple Desktop Display Manager
     Loaded: loaded (/usr/lib/systemd/system/sddm.service; enabled; preset: enabled)
    Drop-In: /usr/lib/systemd/system/service.d
             └─10-timeout-abort.conf
     Active: active (running) since Sun 2025-05-04 17:44:53 CEST; 6min ago
 Invocation: 88533cc1d23346d3ae04470ce308b698
       Docs: man:sddm(1)
             man:sddm.conf(5)
   Main PID: 5206 (sddm)
      Tasks: 2 (limit: 76601)
     Memory: 5.2M (peak: 6.2M)
        CPU: 22ms
     CGroup: /system.slice/sddm.service
             └─5206 /usr/bin/sddm

Mai 04 17:44:53 hostname systemd[1]: Started sddm.service - Simple Desktop Display Manager.
Mai 04 17:44:54 hostname sddm-helper[5211]: Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
                                          Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
                                          If this causes problems, reconfigure your locale. See the locale(1) manual
                                          for more information.
Mai 04 17:44:54 hostname sddm-helper[5211]: pam_unix(sddm-autologin:session): session opened for user user_id(uid=1000) by user_id(uid=0)
Mai 04 17:44:54 hostname sddm-helper[5211]: gkr-pam: gnome-keyring-daemon started properly
Mai 04 17:44:54 hostname sddm-helper[5211]: Starting Wayland user session: "/etc/sddm/wayland-session" "/usr/bin/gnome-session-oneshot"

I also read in another thread (Steam no longer starts - #3 by MiniMechazawa) that __GL_CONSTANT_FRAME_RATE_HINT=3 steam -reset might be a fix, but it did not make any difference. Of course I did ujust upgrade. I also did try ujust fix-reset-steam.

Lastly more information about the card I am using:

user_id@hostname:~$ lspci -nn | grep -P "(VGA compatible|3D) controller"
    20:	01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GA102 [GeForce RTX 3080 Ti] [10de:2208] (rev a1)

and

user_id@hostname:~$ journalctl -t gamemode-sdl-workaround
-- No entries --