With multiple monitors, screen can be locked, but unlock dialog won't appear

Bug #62983 reported by Brian Rogers
2
Affects Status Importance Assigned to Milestone
gnome-screensaver (Ubuntu)
New
Undecided
Unassigned

Bug Description

I have a dual-head nVidia card, configured to use my LCD monitor as screen 0 and my TV as screen 1 (to the left of the monitor). I can lock the screen, but it only fades to black. Even when a screen saver is set, it never starts. Instead, the cursor momentarily disappears, then it reappears.

After this, moving the mouse around does nothing but move the cursor, and both screens remain completely black except for the cursor. The interface to unlock the screen never appears and typing my password blindly does not work. My only option is to kill the entire session and log in again.

I have verified, using both the nvidia driver and the nv driver, that a single-screen configuration does not exhibit this problem. It starts the screen saver properly when the screen is locked, and allows me to type my password and unlock it.

This bug is very bad when the screensaver starts automatically after a period inactivity and locks the screen.

Revision history for this message
Brian Rogers (brian-rogers) wrote :

After a little research, it appears that gnome-screensaver is responsible for locking, so I am moving this bug.

I can trigger the locking by running
gnome-screensaver-command --lock

Also, I notice that I can still interact with my desktop even though the screen is black. It's as if gnome-screensaver crashes, leaving the brightness at zero.

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