Bug#801191: nvidia-driver: gdm3 can't start anymore (acceleration check failed)

[Andreas Beckmann]

On 2015-10-07 18:43, Manuel Bilderbeek wrote:
>> Please send the output of these 2 commands:
>>
>> find /dev/dri* /dev/nvidia* -ls
> 
> $ find /dev/dri* /dev/nvidia* -ls
>  10721    0 drwxr-xr-x   2 root     root           60 okt  7 14:13 /dev/dri
>  10722    0 crw-rw----   1 root     video             okt  7 14:13
> /dev/dri/card0
>  15614    0 crw-rw-rw-   1 root     root              okt  7 14:13
> /dev/nvidia0
>  16557    0 crw-rw-rw-   1 root     root              okt  7 14:13
> /dev/nvidiactl

These permissions (666 on the nvidia devices) are wrong ... and make
things work :-(

So let's check whether this is actually the case.

Go to a console (Ctrl-Alt-F1)
- stop gdm
    invoke-rc.d gdm 3 stop
- and reload the module manually
    modprobe -r nvidia
    modprobe nvidia
    ls -la /dev/nvidia*
- the nvidia devices should have 660 permissions now
- starting gdm should fail with the known error
    invoke-rc.d gdm3 start

The way the module gets loaded upon boot is somehow wrong since it is
ignoring the module options, so it works after reboot.



Andreas