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I am using 12.04 LTS here at work and since the last update cycle, Compiz is completely not running anymore. I use the "hot corner" a lot, as well as configured 4x2 virtual desktops (only have 2x2 now).

I haven't done any changes, only run the updates.

How can I get compiz running again as my default WM?

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up vote 0 down vote accepted

I have found the answer. Apparently, Ubuntu does not ship the latest version of the Catalyst AMD driver (I have a Radeon) and because the shipped driver stopped supporting my card, it fell back to a standard driver.

All I had to do was install the latest AMD drivers and reconfig Compiz again.

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