[Bug 89134] [HSW/BXT]igt/kms_flip/2x-vblank-vs-dpms-suspend failed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89134

--- Comment #5 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Just FYI, the 2x cases are prone to fail unless the two pipes are running at
precisely the same refresh rate. Otherwise they'll eventually drift apart
causing the test to fail.

Neither does the kernel attempt to minimize the phase difference between the
pipes even if the refresh rates are identical. We should probably do that,
especially for the "multiple MST streams make up one display" case. Otherwise
that could lead to a visible tear between the "panels".

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