I tried to reproduce this bug with Alpha release 2 of Karmic Koala (live
CD). However, this behave differently then. The display never shuts down
if I were to boot it from CD. If I press Ctrl+Alt+L, display simply goes
blank (with background lit), and never shuts off. As stupid as it might
sound, I changed the passwd to check if pretending to be a "real" user
makes a difference; but it didn't! So I guess I won't be able to
reproduce it with live CD.

As an aside, I noticed this behavior with Jaunty installation: I mostly
use my laptop under my login (jeenu). However, I have another login for
friends (guest). If it so happens that I do a "switch user" from jeenu
to guest, then:

* The LCD brightness is reset to maximum, no matter what preference is set in 
guest login. Also, it never comes back to default level, even if I switch back 
to jeenu - I've to crank it down manually (well, it does sometimes, but rarely)
* Even if display were to sleep (either by timeout or by manually locking 
screen), it never shuts off! It just goes blank, with background lit.

I think all these are related. I'm glad to provide you with any logs
that you might require - please let me know.

-- 
Display wakes up bright on power loss, and doesn't go off
https://bugs.launchpad.net/bugs/377166
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