Public bug reported:

Binary package hint: metacity

If I switch virtual desktops using ctrl+alt+arrow key, releasing the
arrow key and hitting L instead does nothing at all.

Steps to repro:
0. Have Desktop effects turned off (not sure if this is essential) and multiple 
virtual desktops
1. Switch from one desktop to another using ctrl+alt+arrow keys.  Leave 
ctrl+alt depressed
2. Press L along with the still-depressed ctrl+alt

What I expect to happen:
Screen should blank; password dialog should appear if I move the mouse or touch 
the keyboard

What actually happens:
Nothing.

Workaround:
If you release ctrl+alt and then hit ctrl+alt+L, it locks the screen just as 
expected.

Fundamental security hygiene as well as company policy requires that I
lock my screen when I leave my computer.  Annoyingly, I frequently find
myself returning to an unlocked screen when I have fetched my cup of
coffee, or whatever.  I believe I have now pinpointed the cause: if I
switched virtual screens (e.g. so I remember to check my mail when I
return to my desk) just before leaving, the computer would not lock.
Further experimentation revealed that if I release the ctrl+alt keys and
then press ctrl+alt+L, locking seems to work just fine, but if I keep
ctrl+alt depressed after pressing an arrow key and press L, nothing
happens.

Sorry if this is filed against the wrong package.  I do not currently
have an environment where I can try this under Compiz (i.e. with desktop
effects enabled).

$ lsb_release -rd
Description:    Ubuntu 10.04.1 LTS
Release:        10.04

$ apt-cache policy metacity
metacity:
  Installed: 1:2.30.1-0ubuntu1
  Candidate: 1:2.30.1-0ubuntu1
  Version table:
 *** 1:2.30.1-0ubuntu1 0
        500 http://mirrors.nic.funet.fi/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status

** Affects: metacity (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Lock screen key combo does nothing immediately after switching virtual desktops
https://bugs.launchpad.net/bugs/631544
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