nvidia device permissions in jessie

[Luca Boccassi]

On Sun, 2015-10-11 at 20:52 +0200, Andreas Beckmann wrote:
> On 2015-10-11 19:10, Luca Boccassi wrote:
> > Here's the output on a fresh Jessie 8.2 amd64 installation on a desktop
> > with a 780gtx, after installing nvidia-driver and rebooting with a basic
> > xorg.conf:
> > 
> >   9659    0 drwxr-xr-x   2 root     root           60 Oct 11 18:02 /dev/dri
> >   9660    0 crw-rw----   1 root     video             Oct 11 18:02 /dev/dri/card0
> >  13362    0 crw-rw-rw-   1 root     root              Oct 11 18:02 /dev/nvidia0
> >  13359    0 crw-rw-rw-   1 root     root              Oct 11 18:02 /dev/nvidiactl
> 
> Hmm, not really what we want ...
> 
> can you run this (in a console) and send the transcript?
> 
> ls -l /dev/nvidia*
> invoke-rc.d gdm3 stop
> rmmod nvidia
> lsmod | grep nvidia
> ls -l /dev/nvidia*
> modprobe -v nvidia
> ls -l /dev/nvidia*
> invoke-rc.d gdm3 start
> 
> If gdm3 fails to start now, stop here
> 
> How does this look with the nvidia packages from jessie-backports?
> (340.93-3~bpo8+1)
> I'm afraid we could hit the 'adduser *dm video' bug here ... (don't fix
> it this way).

Shoved it into a script with -x and ran it as root. Changed rmmod to
modprobe -r since nvidia is used by i2c_core, and invoke-rc.d with
systemctl since I'm running systemd.

+ ls -l /dev/nvidia0 /dev/nvidiactl
crw-rw-rw- 1 root root 195,   0 Oct 11 20:15 /dev/nvidia0
crw-rw-rw- 1 root root 195, 255 Oct 11 20:15 /dev/nvidiactl
+ systemctl stop gdm3
+ modprobe -r nvidia
rmmod: ERROR: Module nvidia_uvm is not currently loaded
modprobe: FATAL: Error running remove command for nvidia_current
+ lsmod
+ grep nvidia
+ ls -l /dev/nvidia0 /dev/nvidiactl
crw-rw-rw- 1 root root 195,   0 Oct 11 20:15 /dev/nvidia0
crw-rw-rw- 1 root root 195, 255 Oct 11 20:15 /dev/nvidiactl
+ modprobe -v nvidia
insmod /lib/modules/3.16.0-4-amd64/updates/dkms/nvidia-current.ko NVreg_DeviceFileUID=0 NVreg_DeviceFileGID=44 NVreg_DeviceFileMode=0660 
+ ls -l /dev/nvidia0 /dev/nvidiactl
crw-rw-rw- 1 root root 195,   0 Oct 11 20:15 /dev/nvidia0
crw-rw-rw- 1 root root 195, 255 Oct 11 20:15 /dev/nvidiactl
+ lsmod
+ grep nvidia
nvidia              10507891  0 
drm                   249955  2 nvidia
i2c_core               46012  3 drm,i2c_i801,nvidia
+ systemctl start gdm3
+ ls -l /dev/nvidia0 /dev/nvidiactl
crw-rw---- 1 root video 195,   0 Oct 11 20:15 /dev/nvidia0
crw-rw---- 1 root video 195, 255 Oct 11 20:15 /dev/nvidiactl

Permissions and ownership change after starting gdm3, and Gnome oopses
with the usual "Something has gone wrong" screen.

Kind regards,
Luca Boccassi
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