Bug#800327: Bug#799948: Permission issue with GDM and NVidia

[Luca Boccassi]

On Sep 30, 2015 17:26, "Andreas Beckmann" <anbe at debian.org> wrote:
>
> On 2015-09-29 10:31, Luca Boccassi wrote:
> > Another solution would be having the DM packages themselves add their
users
> > to the video group on install as well, but I'd be wary of adding
> > workarounds in other packages, especially when it involves extending
> > privileges, and I suspect the respective mainteiners feel the same way.
> >
> > Andreas, Vincent, what are your thoughts on this?
>
> I don't have time to dig into this right now. IIRC some consolekit magic
> puts the local X user into to the video group, so GL works for the
> logged in user... but not for most *dm.
>
> Did someone check whether this behavior depends on systemd vs. sysvinit?
>
> Do the device permissions differ dependening on the way the nvidia
> module was loaded?

Ran a few tests, with glx-alternatives 0.6 and 340.93-2, and without gdm in
video group:

old modprobe, sysvinit: gdm works!
old modprobe, systemd: gdm oops

new modprobe, systemd: gdm oops
new modprobe, sysvinit: gdm oops

The first result is interesting I think, I'd expected it to work.

> We should get the maintainers of the affected *dm packages involved in
> this discussion.

There's a bug open against gdm, cc'ed.

Kind regards,
Luca Boccassi
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