Coming out of screen lock mode

Marius Gedminas marius at
Fri Dec 16 13:24:52 UTC 2011


On Fri, Dec 16, 2011 at 10:51:03AM +0100, Alain Muls wrote:
> I am running Ubuntu 11.10 using Unity.
> I like the unity interface but I have since a couple of weeks a major
> problem.
> Sometimes when the screen is locked (screensaving mode), the system
> will not redisplay.
> Everything is still running (eg. a script continues to run) but the
> X-display is black with only a mouse cursor visible.

Sounds like a bug I've seen a few times.  Do you know what video card
you have?  ('lspci|grep VGA' in a terminal is probably the simplest way
to check)

> Is there anything I can change?

What used to help me was killing and restarting compiz.  I'd switch to a
text console with Ctrl+Alt+F1, log in, killall -9 compiz, restart compiz
on the console with DISPLAY=:0 compiz, switch back to the GUI with
Ctrl+Alt+F7, which should be working now, and then restart unity for
good measure (Alt+F2, unity, Enter).  Then switch back to Ctrl+Alt+F1
and log out from the text console, and go back to the GUI with
Ctrl+Alt+F7 again.

Annoying, as you can see, but perhaps a bit less annoying than

Marius Gedminas
Your eyes are weary from staring at the CRT.  You feel sleepy.  Notice how
restful it is to watch the cursor blink.  Close your eyes.  The opinions
stated above are yours.  You cannot imagine why you ever felt otherwise.
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