Re: Xorg tearing fix on Intel HD Graphics 4000

[Chris Marusich <cmmarusich@gmail.com>]

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Roel Janssen <roel@gnu.org> writes:

> Chris Marusich writes:
>
>> Roel Janssen <roel@gnu.org> writes:
>>
>>> Ricardo Wurmus writes:
>>>
>>>> Hi Roel,
>>>>
>>>>> With the following patch to the Xorg configuration file, I have a
>>>>> tear-free GuixSD experience.  I wonder if this is upstreameable in some
>>>>> way.  This patch is probably too broad in effect.  Can I change it so
>>>>> that only the graphics card I have will be affected by this patch?
>>>>
>>>> I’m not sure about this, but you can apply it only to your system by
>>>> changing the slim-service’s “startx” value like this:
>>>>
>>>> --8<---------------cut here---------------start------------->8---
>>>>     (modify-services %desktop-services
>>>>       (slim-service-type
>>>>        config => (slim-configuration
>>>>                   (inherit config)
>>>>                   (startx (xorg-start-command
>>>>                            #:configuration-file
>>>>                            (xorg-configuration-file
>>>>                             #:extra-config
>>>>                             (list your-fix)))))))
>>>> --8<---------------cut here---------------end--------------->8---
>>>>
>>>> But I suppose what you want is to apply it unconditionally in Guix and
>>>> have the X server ignore it for all but this one graphics card, right?
>>>
>>> No, not necessarily.  I could no longer do 'guix pull && guix system
>>> reconfigure ...', which I attempted to solve by upstreaming this patch.
>>
>> Why wouldn't you be able to do a 'guix pull && guix system reconfigure'?
>
> Because that would build a system generation which doesn't contain the
> patched Xorg config.  Ricardo's snippet solved that.
>
>>
>>> I wonder if anyone else is having the same problem on this hardware..
>>
>> Yes, I have this problem.  I use a Lenovo X200.  Like Mark, graphical
>> Emacs doesn't display characters right, and it's difficult to tell what
>> the buffer actually contains, sometimes.  I've reconfigured my system to
>> use the extra Xorg config you've provided in this thread, and I'll let
>> you know in a week or two if it seems to have fixed the problem.
>
> Thanks.
>
> Kind regards,
> Roel Janssen

Just wanted to close the loop here: I have not had any tearing problems
since applying the patch.  Sounds like the problem has been resolved
through a slightly different means, though (with commit
b049ae2f9708794f83c41171c19ffdfe4f11807e).  Accordingly, I've removed
the extra xorg configuration from my operating system configuration file
and simply reconfigured using the latest origin/master.

Thank you for starting this discussion!  It's really nice to be able to
use graphical emacs now without needing to frequently invoke M-x
redraw-display.

-- 
Chris

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