[Bug 91393] [bdw edp] Screen Flickering

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91393

--- Comment #121 from Mika Kahola <mika.kahola at intel.com> ---
(In reply to Evandro Myller from comment #120)
> (In reply to Mika Kahola from comment #117)
> > Created attachment 123877 [details] [review] [review]
> > Revert Fast Link Training
> > 
> > This patch reverts the fast link training feature. However, I have seen that
> > some of the flickering issues are not caused by this feature. Please, give
> > this a go and report back if this patch fixes the screen flickering.
> 
> Mika, I've been following this thread for a while now.
> 
> Since kernel 4.3, I always tried and compiled it with a patch that disabled
> the fast link training feature and it worked. Now, for kernel 4.6, I tried
> your latest patch and once again my screen is working like a charm. Earlier
> today, I also tried the latest original kernel, but the flickering was even
> worse than in previous versions - one can't even pass the gdm login screen!
> 
> Please let me know if I can provide and logs or dumps, and their specific
> files.
> 
> Thank you.

Are you using DP or eDP? Does your panel support PSR? For eDP the fast link
training should be ok as you could assume that the cable length and connections
are not changing. Anyway, logs and dumps are always welcomed as there are quite
a variety of different HW combinations out there.

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