Version: 6.4.10-2: amd64


Severity: important


Tags: cinnamon, forky, sid, trixie


Bug Description:


With the live ISO of Debian 13 Trixie Cinnamon, on my system (AMD 5950x + RTX 5070 Ti), the system boot but it's impossible to access a graphic session.


It displays an error message on startup :


nouveau 0000:00:00.0 unknown chipset (1b300a1)


After this I can use the text console. If I use the commande line "startx" the graphical environment then starts without problems.


If I edit Grub at boot and add the function "nouveau.modeset=0" like below, there is no change, it still does not work :


GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nouveau.modeset=0"


This affects all ISOs when you using Cinnamon.


Strangely this problem is only present under Cinanmon, everything works fine from Gnome.


I am attaching the files :


- boot.log


- Xorg.0.log


After installing Nvidia's proprietary .run driver, everything is back to normal.


Thank you to correct this as soon as possible.


Best regards.


Philippe

Hi, and sorry for the long delay.

Thanks for the logs, they make the picture clear. The nouveau in the
trixie kernel does not
know your card ("unknown chipset (1b300a1)"), so there is no KMS and no
`/dev/dri/card0` at
all. X still starts, but only on the EFI framebuffer at 800x600, and GLX
falls back to
indirect swrast:

(EE) [drm] Failed to open DRM device for pci:0000:08:00.0: -19
(II) AIGLX: Screen 0 is not DRI2 capable
(II) IGLX: Loaded and initialized swrast

Cinnamon needs a GL context it can actually use, so it does not get that
far, which is why
you end up without a session. Nothing in the cinnamon package can fix
that: the missing
piece is the kernel driver, so installing the NVIDIA driver, as you did,
is the right
answer for now. A newer kernel from trixie-backports may also help,
though I cannot tell
from here whether nouveau supports your card yet.

One thing worth trying, if you ever want the open driver: at the login
screen pick the
session "Cinnamon (Software Rendering)" instead of "Cinnamon". It runs
Cinnamon with
`LIBGL_ALWAYS_SOFTWARE=1`, which works even with no DRM device. If that
gets you a usable
desktop where the normal session does not, I would very much like to know.

Your report was useful beyond your own machine: upstream has just
removed that session from
the display manager, so I opened linuxmint/Cinnamon#13996 asking how the
no-usable-GL case
should be handled from now on, and linuxmint/cinnamon-session#218 about
the leftover
detection helper nobody calls.

If you want to dig further, the missing pieces are
`/var/log/lightdm/lightdm.log`,
`/var/log/lightdm/x-0.log` and `~/.xsession-errors` from a boot without
the NVIDIA driver,
plus what exactly your `startx` launches (`~/.xinitrc`), since that is
the part I could not
reproduce.

Thanks,
Fabio