[Bug 91393] [bdw edp] Screen Flickering

[bugzilla-daemon at freedesktop.org]

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

--- Comment #112 from alex at alexforencich.com ---
(In reply to Mika Kahola from comment #110)
> (In reply to alex from comment #109)
> > Dammit.  Now this regression has made it into the LTS kernel.  Are you guys
> > kidding me?  Is it not possible for the changes that caused this
> > exceptionally annoying regression (as in my computer is now almost entirely
> > unusable) to be removed from the current production kernel, pending a proper
> > fix?????
> 
> My current understanding is that there are multiple causes for flickering.
> Reverting this patch may solve an issue with one platform. Could you share
> your dmesg log with drm.debug=0x1e for further analysis, please.

Posted.  I rebooted into the stock 4.5.1 kernel (direct from the Arch
repository) with drm.debug=0x1e added to the kernel command line, logged in,
suspended, resumed, and dumped the log with journalctl.  I took a quick check
through and didn't see any messages that indicated any sort of failure after
the suspend operation.  However there are a lot of messages in there, so I
could have missed something.  What I do know is that after the resume from
suspend, I get something on the order of a 2 Hz flicker on the display that
looks like the eDP link is flapping - i.e. there is tearing that affects the
bottom portion of the display more than the top due to the link going down in
the middle of a frame, portions of the display are briefly distorted or colored
strangely, etc.  None of this happens on 4.1.21, which is where I will stay
until this gets a proper fix in the mainline.

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