[Bug 76699] [ivb/hsw] suddenly slow intel graphics

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76699

--- Comment #21 from Enrico Tagliavini <enrico.tagliavini at gmail.com> ---
Hi everybody,

I hope I have a good news. Since I had the issue exposed by KDE KWin I tried to
ask to its developers if they had some advise. Thomas Lübking pointed me to bug
#74316 and https://bugs.kde.org/show_bug.cgi?id=330986 . He suggested to apply
the patches to mesa 10.1.0 to see if the problem was fixed by them from comment
8 in the FDO bug report. I was not able to. Patches were rejected. So I gone to
the simple and lazy way and I checked out git master for mesa, which includes
that code. The issue looks solved, I'm running xorg xserver 1.15, mesa git
master from today and KWin with full screen repaints enabled.

If I understood well that code is already in queue for mesa 10.1.1 so hopefully
it will be fixed in a release soon.

I would like to thank you Thomas Lübking for the winner advise, Martin Gräßlin
for his offer of help and Chris Wilson for the patience of spending 2 days with
me trying to debug the issue on IRC and answering my newbie questions.

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