Re: Xorg tearing fix on Intel HD Graphics 4000

[Roel Janssen <roel@gnu.org>]

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