This behavior just started for me too, in 11.10 with an ATI card.
ATI Technologies Inc RS880 [Radeon HD 4200]
I have been having a lot of trouble on the system with a different distro bug,
https://bugs.launchpad.net/ubuntu/+source/sysvinit/+bug/858122
and had hoped this weeks bunch of updates would improve that. Well, it got
worse immediately after these updates.
I have no idea what triggers it. Probably karma, payback for general
bad-personhood.
Anyway, the general problem is that the Metacity window manager isn't
being started on log-in.
To fix this, under the main menu, System Tools -> Startup Applications.
In my case, Metacity wasn't listed, so I added it, with data
Metacity
/usr/bin/metacity
Window Manager
made sure the item was checked, and re-logged in.
Now Compiz starts.
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https://bugs.launchpad.net/bugs/446566
Title:
Compiz not starting automatically on login
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