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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #11 from Enrico Tagliavini <enrico.tagliavini at gmail.com> ---
Looks like I have the same problem.

GPU: IVB 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core
processor Graphics Controller (rev 09)
CPU: core i7-3667U

OS: gentoo

Today I updated xorg server to 1.15 from 1.14 and video-intel from 2.99.910 to
2.99.911 alongside a bunch of xorg, proto and similar packages. Mesa was
already at 10.1.0 and was working well until this update (very well I should
say).

I can downgrade video-intel if needed, Xorg is a bit more complicated.

Symptom: I use KDE (4.11.5 atm), with vsync enabled in KWin. I use the setting
"full screen repaints", which is the only one giving me tear free VLC. From the
update I get something like 5 fps fopr screen updates. glxgears still reports
around 60, even if what is displayed is obviously less. Guess the compositor is
in the middle here as well.

Using the automatic vsync setting, will trigger the issue only when KWin choose
to enable vsync, so it is harder to reproduce. Disabling vsync cause no issue
at all.

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