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

[David Herrmann]

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

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

Thanks
David