[Bug 98553] [IVB/BXT] performance failure when running kms_setmode basic

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98553

--- Comment #15 from Joseph Garvey <joseph1.garvey at intel.com> ---
(In reply to Chris Wilson from comment #7)
> It's a new test. It may simply be asking for much precision. The failure is
> an error of +-20us, which is greater than a scanline and our accuracy goal
> is roughly half a scanline.

The first assertion, that "99.7% samples within one scanline on each side of
mean", is also failing (on BDW and HSW from what I've tried). If you relax it
to 95%, the test passes - but that's a pretty low MTBF. What makes 5.6s the
lowest acceptable MTBF? Also, how much does vblank accuracy depend on the
hardware and should the test take that into consideration?

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