Bug#800938: Bug#799948: Plasma desktop is unable to start (black screen - panic)

[Luca Boccassi]

On Tue, 2015-10-20 at 11:56 +0200, Miguel Angel Rojas wrote:
>         
>         I must first say that I am absolutely not familiar with KDE,
>         the QT
>         environment and how it works. But the thread that raises the
>         abort
>         doesn't look like it's in the GL libraries code:
>         
>         Maybe there's some context I'm missing. Forgive me for asking,
>         but are
>         you sure this is due to the Nvidia driver packages or
>         glx-alternatives?
>         
> 
> 
> Hi Luca,
> 
> 
> But indeed, it is! I conducted the same experiments as Vladimir did
> with the same result. Something is wrong with the glx beyond 0.6.x
> (bad packaging, new API, new behavior? I don't know). I would
> recommend to reproduce as it is very easy to do it and you will see
> what we are talking about.

Hi Miguel,

The reason I'm asking is because I can't reproduce any problems on GDM,
with any software that uses GLX or other libraries, after adding the
workaround.

But I noticed something looking again at the system info you forwarded,
the only user in the "video" group is sddm:

video:x:44:sddm

I verified yesterday that even on GDM both the DM-manager user (in my
case Debian-gdm) AND my user MUST be in the video group, otherwise the
problem occurs.

Could you please try to add your user to the video group and see if that
helps?

> Talking about Bug #799948, is there a reason why sddm user should be
> included in video? (because it seems to be the workaround) If so,
> someone should notify sddm guys that is somehow required due to new
> upstream requirement in nvidia glx packages. We don't have a clear
> explanation about it.

We are still discussing and investigating that. It is not a new upstream
requirement but a fix to the device nodes permissions that we are trying
out, but it seems to be causing way too much grief. Please see this
message by Andreas [1] for more details about the background.

Kind regards,
Luca Boccassi
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