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

[Miguel A. Rojas]

On 10/21/2015 12:22 AM, Luca Boccassi wrote:
>> 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?
And it seems that works like a charm! It seems KDE only needs sddm and 
your user to be included in the video group. No more panics or black 
screens.

Good shot!

> 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
I am sorry, I don't see the message from Andreas your are referring to.

Thanks!