[Bug 36326] [uxa 915GM] Characters sometimes have horizontal lines through them (glyph font corruption)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=36326

--- Comment #81 from Paul Menzel <paulepanter at users.sourceforge.net> ---
(In reply to comment #76)
> Sitsofe reports that commit 441ef916ae6569c88b3d6abaf7fea4d69be49d76
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Thu Jan 10 19:14:21 2013 +0000
> 
>     intel: Throttle harder
>     
> does improve matters, but I'm still at a loss to explain why.

Finally I got some time to test that patch too. I checked out branch
`debian-unstable` from the Debian packaging Git repository [1] (based on
release 2.19.0)

    commit 8ab872522ae0891b8fb52fbb31db52d581c3efa3
    Author: Julien Cristau <jcristau at debian.org>
    Date:   Sun Sep 16 20:47:05 2012 +0200

        Upload to unstable

and applied the following patch on top of it.

    commit f49c3cacd25ffb78ccfff49b001ba89375044145
    Author: Chris Wilson <chris at chris-wilson.co.uk>
    Date:   Thu Jan 10 19:14:21 2013 +0000

        intel: Throttle harder

Limited testing shows that the glyph corruption is gone. Unfortunately
performance seems to be slower too. That means for example maximizing a window
it does not happen instantly and I can see how it is redrawn. So basically the
same behavior with `"DebugWait" "true"`, if I remember correctly.


[1]
http://anonscm.debian.org/gitweb/?p=pkg-xorg/driver/xserver-xorg-video-intel.git;a=summary

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