[Bug 97450] [SKL] [regression] Random display flickering on Kernel 4.8 with dual-screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97450

--- Comment #29 from rockorequin at hotmail.com ---
> Based on your comments, I can see that:
> - Patch "fix DDB partitioning" improves the situation but 
> doesn't completely solve the problem
> - Patch "unconditionally apply memory WAs" helps solving the 
> remaining issues.
> 
> Is that correct?

Yes, I think that should be correct, although I should probably test for longer
because "fix DDB partitioning" reduces the occurrence of the flickering
considerably so I should give it a chance to re-occur. But so far, so good.
(FWIW, "fix DDB partitioning" also fixes
https://bugs.freedesktop.org/show_bug.cgi?id=97596, so it's an important
patch.)

I am still seeing some atomic update failure messages in the log with my
patched 4.8.1. For example:

[  955.923097] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure
on pipe B (start=55693 end=55694) time 102 us, min 1073, max 1079, scanline
start 1072, end 1079

Are they anything to be concerned about?

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