[Bug 68718] [snb] vsync hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68718

--- Comment #13 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to comment #10)
> Cool, that's important as for Ivybridge it is documented that the GPU must
> be kept awake across the vsync, so it does not look like that is required
> here.
> 
> Which leaves the open question whether any Sandybridges sold did not have
> the vsync feature (it was only added very late in the development cycle), or
> if there is a w/a that I missed.

I'm not really sure what you meant by your comment... Do the new traces show
the same vsync error, or are they due to some other thing that maps triggers?
(In the latter case should I file a fresh bug?)

As for SNB revision, not sure if this is enough to identify which one I have,
but here's some info:

00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if
00 [VGA controller])
        Subsystem: Lenovo Device [17aa:21d2]

vendor_id       : GenuineIntel
cpu family      : 6
model           : 42
model name      : Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz
stepping        : 7
microcode       : 0x28

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