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Description
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If xscreensaver tries to lock the screen during a Gnome typing break
it fails to grab the keyboard and gives up. However, it still manages
to grab the mouse and doesn't appear to release it. The result it that
the screen contents are visible and the keyboard working as input for
the current window but the mouse doesn't work.
Steps to reproduce:
1. Set typing break (Gnome preferences, Keyboard, typing break) to
something short (eg 1 minute and 1 minute). The "postpone" feature
doesn't appear to make a difference.
2. Wait until the typing break is about to cut in (flashing icon
in the Gnome panel).
3. Set the screen to lock in 30 seconds:
$ sleep 30; xscreensaver-command -lock
4. Let the typing break cut in
5. After 30 seconds the mouse cursor disappears
6. After 1 minute the typing break ends
Result: Keyboard activity in the current window works, the mouse is
not visible or apparently working.
Resolution: Lock the screen again
If xscreensaver is run in verbose mode the following messages are
seen. This is from a dual-head Sun Ray:
- With "postpone" feature enabled
xscreensaver: LOCK ClientMessage received; activating and locking.
going to lock screen A
Xlib: extension "XFree86-Misc" missing on display ":15".
xscreensaver: blanking screen at Tue Mar 6 10:26:45 2007.
--> init_file_changed()
xscreensaver: mouse is on screen 1 of 2
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: couldn't grab keyboard! (AlreadyGrabbed)
xscreensaver: 1: removing focus from 0xeb659f / RevertToParent.
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: couldn't grab keyboard! (AlreadyGrabbed)
xscreensaver: 1: grabbing mouse on 0x3a... GrabSuccess.
xscreensaver: unable to grab keyboard or mouse! Blanking aborted.
Xlib: extension "XFree86-Misc" missing on display ":15".
xscreensaver: awaiting idleness.
- Without "postpone" feature enabled
xscreensaver: LOCK ClientMessage received; activating and locking.
going to lock screen A
Xlib: extension "XFree86-Misc" missing on display ":15".
xscreensaver: blanking screen at Tue Mar 6 10:33:40 2007.
--> init_file_changed()
xscreensaver: mouse is on screen 1 of 2
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: couldn't grab keyboard! (AlreadyGrabbed)
xscreensaver: 1: removing focus from 0xeb659f / RevertToParent.
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: 1: grabbing keyboard on 0x3a... AlreadyGrabbed.
xscreensaver: couldn't grab keyboard! (AlreadyGrabbed)
xscreensaver: 1: grabbing mouse on 0x3a... GrabSuccess.
xscreensaver: unable to grab keyboard or mouse! Blanking aborted.
Xlib: extension "XFree86-Misc" missing on display ":15".
xscreensaver: awaiting idleness.
This is a particular problem for Sun Ray users as pulling the card out
of the Sun Ray typically locks the screen. Once a typing break cuts in
the instinctive reaction is to remove the card and walk away for a
break. On return the screen can be viewed and keyboard used (in the
current window) without unlocking the screen simply by re-inserting
the card.
If a sufficiently long typing break is taken xscreensaver starts again
and now locks the screen successfully.
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