[Bug 97596] [SKL] [regression] Flickering artefact window at top left of screens in kernel 4.8-rc5

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97596

--- Comment #2 from rockorequin at hotmail.com ---
Created attachment 126473
  --> https://bugs.freedesktop.org/attachment.cgi?id=126473&action=edit
dmesg with drm.debug=0xe

> So, there is chance that it is dup of bug 97450, 

There's always a chance it has the same underlying cause. But that bug has
completely different symptoms. That bug refers to the whole screen flickering,
whereas in this bug there is only a small window flickering at the top left of
the screens; that bug is not related to cursor movement, whereas in this bug it
is triggered by moving the mouse between screens; and in that bug it only
occurs on the external monitor, whereas in this bug it occurs on both monitors.

> and therefore can you confirm if, without any external display connected, it is occurring on your laptop display?

It does not occur with no external display connected. I didn't really expect it
to, since it's kind of hard to move the mouse between the displays with no
external display connected :) To add to the original report description, I
believe now that occurs every time the mouse moves between the displays, and
additionally it occurs on the first keypress in the gnome terminal immediately
after the mouse is moved into the the display and gnome-terminal selected. So
moving the mouse between displays is the trigger.

> Moreover, add drm.debug=0xe on the boot command line and then attached new kernel log

See attached dmesg. I also have a full syslog if you need.

It's still an issue in 4.8-rc6. Also, I saw these while installing 4.8-rc6, in
case they are relevant, although I don't think they are for skylake:

W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for module
i915
W: Possible missing firmware /lib/firmware/i915/bxt_guc_ver8_7.bin for module
i915

--- Comment #3 from rockorequin at hotmail.com ---
I'm adding this comment only because when I submitted comment #2 just now, the
server reported a sendmail error due to running out of memory, and hopefully it
will work this time...

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