Public bug reported:
Both my home and work machines, running Ubuntu Gnome 16.04, both fully
up to date suffer this issue. I check both machines for updates daily in
a hope for a fix to this extremely bothersome issue.
The machines both have external monitors, and if I lock the screen with
Win+L the screen will lock then sleep. A few seconds later, when the
external monitor goes into "sleep" mode, the computer decides to
"reconfigure" the connected displays (as happens when you unplug a
display physically) and the screen is woken again for a few seconds, the
screens and computer will then shortly thereafter return to sleep,
monitor switches off and the cycle starts all over.
This alone is annoying but not the worst issue. At work this causes all
3 of my screens to switch on and off every few seconds which is annoying
for my colleagues if I'm away from my desk, and at home this results in
the music, playing through my monitor-connected speakers to start/stop
constantly as the monitor goes on and off.
More importantly, once I log back in, gnome-shell is totally
unresponsive and I have to restart it with CTRL+F2, r then performance
returns back to normal, usually I'll see a bug report dialog if I've
left it long enough (say gone out to lunch).
I can add that if I use a "dumb" monitor over VGA for example and no
other external monitors, there is no "sensing" occuring so the problem
does not happen, sadly, most of my monitors are HDMI/DP.
Both machines are laptops and do NOT suffer the issue if NO external
displays are connected.
It seems to me the bug is that the computer shouldn't "reconfigure"
displays when the screen is sleeping and thus wake itself.
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1605875
Title:
screen lock cycles screens on/off constantly
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