I just compiled the latest radeonhd driver from git and I am glad to see that it finally works with my video card - the AMD 6520g. The fglrx drivers were causing a lot of system crashes in Ubuntu 11.10 (AMD64). The only problem that I have with it is that my computer now does not resume from suspend. Ubuntu resumes just fine, but the screen is still off. I can provide any information that you require to help you sort out this bug.
I doubt you are using radeonhd. Please attach your xorg log and dmesg output.
Created attachment 53612 [details] [review] dmesg output Here is my dmesg output.
Created attachment 53613 [details] xorg log Here is my xorg log.
I think you are right Alex. I am using the radeon driver instead of the radeonhd driver.
*** This bug has been marked as a duplicate of bug 42960 ***
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