Public bug reported:
Details:
1. Issue has been happening since 11.10, but same thing still happens in 12.04.
2. Hardware: HP EliteBook 8440p with Intel Graphics.
3. Only happens when the system is docked, otherwise there is no issue.
Steps to Reproduce:
1. Go to "Brightness and Lock".
2. Set the screen to turn off when inactive for 10 minutes (though timeframe
doesn't seem to matter).
3. Set "Lock screen after:" to "Screen turns off".
4. Wait for the screen to dim and turn blank.
5. Wait longer for the screen to power off completely.
6. Wait another minute or so.
7, The external monitor will start to flicker on-and-off for a bit.
8. Try to unlock the screen.
9. The screen will successfully unlock.
10. Once unlocked you will see that your window manager (Compiz) has melted
down. You cannot resize windows, etc. because the title bars have all
disappeared.
11. I have found no way to recover from this issue short of a reboot (I usually
get to a command terminal and try to shut it down as gracefully as I can).
The only work-around to this issue is to set "Turn screen off when
inactive for:" to "Never". However, this is not ideal as it means the
screen will always continue to suck battery even after the screen has
been locked (even when not docked, unless I remember to change this
setting every time I undock).
I am assuming I cannot be the only one having this issue.
** Affects: gnome-screensaver (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/997433
Title:
Window Manager Crashes after Locking the Screen While Laptop is Docked
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