Reverting to mirror mode suggests the system doesn't recognise the new
config on wakeup as being equal to the old config before sleeping.
One of your configurations in ~/.config/monitors.xml seems to contain a
disabled "unknown" monitor which likely was bug 2060268. So I suggest:
1. Make sure you have the fix for bug 2060268 installed (ubuntu-drivers-
common >= 1:0.9.7.6ubuntu3.1)
2. Delete ~/.config/monitors.xml
3. Log in again and reconfigure your monitors.
Does the problem still occur after that? If so then it could also be
caused by a sub-par display cable reporting lower bandwidth upon waking
from sleep (a common problem). This might make the system treat it as a
new monitor and it won't remember the old layout. The fix for that is
usually to use higher grade display cables.
** Package changed: xorg (Ubuntu) => mutter (Ubuntu)
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
** Summary changed:
- Problems when my computer monitors go to sleep
+ Multimonitor layout is forgotten after waking from sleep
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Desktop Bugs, which is subscribed to mutter in Ubuntu.
https://bugs.launchpad.net/bugs/2080782
Title:
Multimonitor layout is forgotten after waking from sleep
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