[Bug 95176] LCD flickering on Thinkpad T440p (Haswell) with kernel 4.6-rc4 (PSR enabled)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95176

--- Comment #10 from Calvin Walton <calvin.walton at kepstin.ca> ---
I convinced my friend with a ThinkPad X250 (Broadwell processor) to try out a
4.6-rc kernel, and he's seeing the same issue - screen occasionally flickering
black - as well. I didn't have a chance to pull any debug logs on that machine.

My experience is basically the same as dnord - the screen flickering happens
most often when the screen is being intermittently updated. It never happens if
there's a continuous animation like a spinner or a video playing. It seems like
it's most likely to happen shortly after something stops moving/changing
onscreen - perhaps it's flickering when psr is activating?

I confirmed earlier that it happened with both the enable_psr=2 and
enable_psr=3 modes (I tried both with a clean boot), but I had to wait longer
to see a flicker happen when using the '3' mode.

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