[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 #22 from rockorequin at hotmail.com ---
Some more observations regarding the flickering artefact window:

1. I can also make it happen without even moving the mouse between screens if I
click on the desktop and then click in gnome-terminal and press a key. (The
artefact window flickers in the same screen as gnome-terminal.)

2. The flickering happens whether I mirror the screens, have the HDMI above the
eDP, or have the HDMI to the right of the eDP, so it doesn't appear to be
related to screen geometry.

3. If I either physically unplug the HDMI screen or turn it off with xrandr,
the flickering artefact window does not occur until I plug it back in/turn it
back on with xrandr.

4. Right now, if I move the mouse from the HDMI screen (on top) into the eDPI
screen, the artefact window flickers immediately at the top left of the HDMI
screen. If I move the mouse back into the HDMI screen, it doesn't flicker until
the mouse moves approximately one fifth of the way up the HDMI screen, at which
point it flickers at the top left of the eDPI screen.

5. I also see the flickering artefact window when the system is changing
resolutions/geometry (eg to mirrored screen or when starting up lightdm or the
desktop).

6. If I use the xserver intel driver instead of the modesetting driver, I still
see the artefact window, but it's smaller (currently maybe one fifth the size).
It also occurs more quickly as I move the mouse up into the HDMI screen.

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