Re: Xorg tearing fix on Intel HD Graphics 4000

[Andy Wingo <wingo@igalia.com>]

On Tue 27 Jun 2017 19:43, Mark H Weaver <mhw@netris.org> writes:

> Andy Wingo <wingo@igalia.com> writes:
>
>> On Wed 21 Jun 2017 09:55, Roel Janssen <roel@gnu.org> writes:
>>
>>> For a long time now, I have a tearing issue on GuixSD (parts of the
>>> screen do not get updated while others do, resulting in dissapearing
>>> text in Emacs).
>>
>> I wonder if it makes sense to update the intel driver to see if it fixed
>> it?  Then perhaps we could avoid the hack.  There are commits here that
>> touch SNA and things that look like they could be relevant:
>>
>>   https://cgit.freedesktop.org/xorg/driver/xf86-video-intel/log/
>
> It's a good idea, but we're already using HEAD (6babcf1) from their
> repo, and have been since June 11 (guix commit e2de6bbdd5).  I can
> confirm that this didn't solve the problem for me.
>
> In the meantime, how would you feel about pushing the following commit
> to master?  It would still allow the use of SNA by explicitly asking for
> it in xorg.conf, but auto-configuration would choose UXA by default.
>
> What do you think?

Looks good to me.  We should report the problem though... ok I did that
here:

  https://bugs.freedesktop.org/show_bug.cgi?id=101620

Looking forward to having a normal Emacs again :)

Andy