nvidia device permissions in jessie

[Luca Boccassi]

On Sun, 2015-10-11 at 20:24 +0100, Luca Boccassi wrote:
> 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.

The problem is the value of NVreg_Device_file_Mode used by insmod, 0660,
right?

Installed the nvidia-driver packages from backports, and as expected
Gnome oopses on boot. Same result running the script:

+ ls -l /dev/nvidia0 /dev/nvidiactl
crw-rw---- 1 root video 195,   0 Oct 11 20:43 /dev/nvidia0
crw-rw---- 1 root video 195, 255 Oct 11 20:43 /dev/nvidiactl
+ systemctl stop gdm3
+ modprobe -r nvidia
+ lsmod
+ grep nvidia
+ ls -l /dev/nvidia0 /dev/nvidiactl
crw-rw---- 1 root video 195,   0 Oct 11 20:43 /dev/nvidia0
crw-rw---- 1 root video 195, 255 Oct 11 20:43 /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
install modprobe -i nvidia-current $CMDLINE_OPTS NVreg_DeviceFileUID=0 NVreg_DeviceFileGID=44 NVreg_DeviceFileMode=0660 
+ ls -l /dev/nvidia0 /dev/nvidiactl
crw-rw---- 1 root video 195,   0 Oct 11 20:43 /dev/nvidia0
crw-rw---- 1 root video 195, 255 Oct 11 20:43 /dev/nvidiactl
+ lsmod
+ grep nvidia
nvidia              10516083  0 
drm                   249955  2 nvidia
i2c_core               46012  3 drm,i2c_i801,nvidia
+ systemctl start gdm3

Kind regards,
Luca Boccassi
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