On Wed, 21 Jun 2017 09:55:46 +0200
Roel Janssen <roel@gnu.org> wrote:

> 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).
> 
> 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?

This is awesome, thanks for sharing Roel, like you I found Emacs
difficult to use on both of the machines that I run GuixSD on. I've
tested the patch you attached, applied with the configuration that
Ricardo provided on one of those machines, and it worked perfectly!