Public bug reported:

On a powerbook (aluminium G4 14" latest model with RV350 ATI), switching
to console and back to X locks up the system.

The switch to text console works fine. When switching back to X, it locks up 
before X displays anything (you
see the X VT's text content but X doesn't actually get a chance to display 
anything). It spins in a loop eating CPU,
I haven't yet found where, it takes no input. kill -9 works and you can then 
restart X, it will work fine, so it doesn't
look like a GPU crash.

It could be an upstream regression. A quick chat with the X.org ATI driver 
maintainers seems to result in him
strongly suggesting ubuntu updates to version 6.7.193 of the driver which 
according to him contains lots of bug
fixes. I'll check if that version fixes this problem asap (probably not before 
next week though as I'll be offline
for the week-end).

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New

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[gutsy] X locks on console switch on powerbook
https://bugs.launchpad.net/bugs/141119
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