[Bug 67092] [SNB regression vsync] WAIT_FOR_EVENT hangs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67092

bugs at javispedro.com changed:

           What    |Removed                     |Added
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                 CC|                            |bugs at javispedro.com

--- Comment #33 from bugs at javispedro.com ---
I experience a similar issue with 3.7+ kernels that seems to be caused by the
same underlying cause.
This is a Lenovo X220t, (early) SNB graphics.
I use Metacity without compositing, in a dual-monitor setup (internal LVDS +
external VGA1).

Launching glxgears on VGA1 causes lots of "Kicking stuck wait on render ring"
messages on dmesg and the framerate (of the entire screen) drops to something
like 0.1 fps.
Glxgears on LVDS is completely fine (60fps). Launching it on LVDS and then
dragging the window to VGA1, however, also causes the problem. 
The lockups start the moment the center of the glxgears window crosses
monitors, so I suspected Vsync issue, and found this bug report.

Adding 'Option "SwapbuffersWait" "false"' workarounds the problem. 
As does enabling compositing, or switching to UXA.

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