Re: [RFC/PATCH xf86-video-intel] sna: Let modestting + glamor handle gen9+

Hans de Goede
2016-04-22T18:05:17Z

Hi,

On 22-04-16 15:17, Timo Aaltonen wrote:
> 08.04.2016, 16:21, Hans de Goede kirjoitti:
>> Hi,
>
> Hi, sorry for the delay..
>
>> On 11-03-16 11:07, Timo Aaltonen wrote:
>>>
>>> I've been trying to make this work, but there are cases where it fails
>>> bad:
>>>
>>> # a config file with a Device section that loads 'intel' makes the
>>> server fail
>>> [ 10.153] (EE) No devices detected.
>>> [ 10.153] (EE)
>>> Fatal server error:
>>> [ 10.153] (EE) no screens found(EE)
>>>
>>> ie. no fallback in that case
>>>
>>> # with X run as root (wrapper or not), same thing different cause
>>> [ 145.943] (EE) modeset(0): drmSetMaster failed: Invalid argument
>>> [ 145.943] (EE)
>>> Fatal server error:
>>> [ 145.943] (EE) AddScreen/ScreenInit failed for driver 0
>>>
>>>
>>> but it does work with startx run by a user. Tests done on Debian with
>>> 1.18.1 and intel ddx git.
>>
>> This must be some Debian specific issue, I just tried this with Xorg-1.18.3
>> on Fedora, with a Xwrapper.config forcing X to always run as root and it
>> works
>> fine (using startx).
>
> We have a similar wrapper in 'xserver-xorg-legacy' package, but even
> installing that doesn't make xdm work, the xserver fails the same way.
>
> startx _does_ work though
>
>> In that case systemd-logind integration should still work though, so it may
>> be that the way you are starting Xorg causes the systemd-logind integration
>> to not work though, and that the fallback paths for opening the
>> /dev/drm/card#
>> in the modesetting driver are broken. How exactly are you starting X ?
>
> Trying to use a DM other than gdm, in this case xdm. (iirc lightdm fails
> too)
>
>> Can you provide full logs of a failed start ?
>
> Xorg.0.log
> http://paste.debian.net/440250/

Ok, I've managed to reproduce this, this is caused by a pre-existing bug in
the intel driver. I've just send out a patch fixing this.

Regards,

Hans