[Bug 101111] [Regression] backlight flickering/display artifacting on Broadwell integrated graphics with 4.12-rc1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101111

--- Comment #56 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Mark Spencer from comment #51)
> @Jani Nikula
> PSR is disabled because it causes issues such as this among others which we
> try to fix here, so it can be enabled again somewhere in future. It seems we
> finally found source of this issue: DRRS is enabled with PSR which shouldn't
> be allowed. It puzzles me why after year long discussions, two bug reports,
> asking for providing more and more logs you finally come to conclusion that
> it isn't supported.

There's a distinction between a) enabling PSR to actively work on fixing issues
related to it, and b) enabling PSR because some forum said you should and then
filing issues here because it doesn't work out for you.

We've disabled PSR by default because there have been so many issues with it,
and we can't handle the influx of bugs. We keep fixing stuff in the background,
but at the same time we close PSR bugs as not supported. For example, in the
case of this bug, it took until comment #44 to realize this is a PSR related
bug. You also insisted on merging what would have been the completely wrong
patch, and would have made debugging future PSR problems even harder. My gut
feeling in comment #21 was spot on.

So there'll be a happy ending to this bug, the driver will get a bit better
now, and we're a bit closer to enabling PSR, thank you for that. But perhaps
you'll see that there's a reason we generally close what we think are category
b) bugs as not supported.

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