Thanks, that looks similar to bug #1295267
Could you try to do a fresh boot, log in, lock screen, unlock and attach
the Xorg.0.log to the bug?
The logs reported have snippets like
"[ 18.916] (II) intel(0): resizing framebuffer to 3840x1080
[ 18.932] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI2 using pipe
1, position (1920, 0), rotation normal, reflection none
[ 23.688] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI1 using pipe
0, position (1920, 0), rotation normal, reflection none
[ 23.691] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI2 using pipe
1, position (0, 0), rotation normal, reflection none
[ 2239.871] (II) intel(0): resizing framebuffer to 1920x1080
[ 2239.873] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI2 using pipe
0, position (0, 0), rotation normal, reflection none
[ 2240.201] (II) intel(0): resizing framebuffer to 3840x1080"
unsure if that matches an user triggered change or if the monitor config
in xorg changes when power saving starts or something
** Changed in: unity (Ubuntu)
Importance: Undecided => High
** Changed in: unity (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1579678
Title:
ubuntu unity workspace switcher state reset after screen lock
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