Cannot restore session after "locking screen"

[Alessio "Spinus" Moscatello]

After upgrading from natty to oneiric I've started experiencing this issue: if I leave the pc idle for some minutes the screen goes black (because I think that there isn't a default screensaver - see #808512), but I cannot re-enter my session, because the password dialog doesn't come up.

Steps to reproduce:
1)enter the session
2)leave the session idle
3)when the screen goes black wait 5/10 minutes
4)move the mouse/pres some keys
5)the screen remains black

Note: if you move the mouse immediately after the screen goes black (step 2), the password dialog came up and I'm able to enter the password...

Manually locking the screen via menù or keyboard settings trigger the same issue.

P.S: I don't know if this bug is related to gnome-control-center or gnome-screensaver of other package, because I cannot exactly figure out what is going bad...

[Alessio "Spinus" Moscatello (spinus)]

Closing...I've just noticed that this issue is caused by the backlight that is not restored when I move the mouse or press the keyboard, so I must restore the backlight using the keyboard button; so I'm opening another bug...