Hi, i had same problem, just that i installed ati proprietary driver
(fglrx), and compiz didnt wont to work. Everything that I did after was
quoting the blacklist for my chip (rv350), and now works perfect.
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compiz compositing locks up computer for rv350 chip
https://bugs.launchpad.net/bugs/134
I have upgraded from dapper to edgy with alternate cd (no Net access) changed
to egdy in sources.list and went on apt-get dist-upgrade.
Everything went ok till i got note that my gdm wont work.
I tried dpkg-reconfigure and still same thing.
i have access to consoles from 1-7.
I'm using ATI RADEO
