[kmscon-devel] cannot set DRM-master on intel

[glphvgacs]

On Tue, May 06, 2014 at 07:21:31PM +0200, David Herrmann wrote:
> Hi
> 
> On Tue, May 6, 2014 at 6:57 PM, glphvgacs <darwinskernel at gmail.com> wrote:
> > On Tue, May 06, 2014 at 06:55:03PM +0200, David Herrmann wrote:
> >> Hi
> >>
> >> On Tue, May 6, 2014 at 6:46 PM, glphvgacs <darwinskernel at gmail.com> wrote:
> >> > '--hwaccel --no-drm' works.  please see the attached files.
> >>
> >> Yeah, --hwaccel --drm uses mesa to render. This really looks like a
> >> mesa-bug to me. I recommend using --no-hwaccel. If you _really_ want
> >> hw-acceleration,
> >>
> >
> > i suppose you mean --no-drm.
> 
> No, --no-drm should never be used, except for legacy fbdev devices.
> 
> >> please try to get a backtrace for kmscon.
> >>
> >
> > what does one use for that? dtrace?
> 
> No, gdb is enough. Just make sure kmscon creates a core-dump 

how? is it supposed to write it somewhere where systemd knows about?

> and then retrieve the backtrace via "gdb kmscon path/to/core/dump" and
> type "backtrace". You can exit gdb via "quit".
>

i'm worked with gdb but never used 'backtarce', but it seems
straightforward enough. if i can get the core-dump then i guess i know
my way after that.

> 
> If you run systemd with coredumpctl, you can try "systemd-coredumpctl
> gdb kmscon".
> 
> Thanks
> David
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