After some trial and error it seems like I have to rephrase the initial
bug report:
If I resume from suspend caused by systemctl suspend, sudo pm-suspend,
or via the hotkey on my keyboard (K750), the login screen is only shown
on the build-in screen and not on the external monitor. In this case the
external monitor remains off and has to be enabled again by pressing
super+p multiple times.
However, if I resume from suspend caused be the suspend entry in the
menu accessible from the upper right corner (hereafter referred to as
'menu suspend'), the login screen is shown on both screens (build-in and
external). In this case the external monitor works as intended, even
after logging in.
If automatic login is enabled, the login screen is never shown after
resuming (obviously) and both monitors do work as intended. However,
enabling automatic login is not a sufficient work around.
I wasn't able to reproduce this observation on an live CD system (tried
14.04, 14.10, 15.04) since those systems always behaved weird after
another user with password was added.
So, how does 'menu suspend' differ from the other ways mentioned to
suspend the system?
** Changed in: xorg (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1454160
Title:
External monitor is disabled after resume
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