Comment 11 for bug 832681

I had the same error after upgrading some packages (i think Xorg, but not sure)

I am using the proprietary amd 'fglrx' driver and that had NOT been upgraded and WAS working previously so I don't think the error was a missing driver feature (at least in my case).

I remedied this problem by restarting in recovery mode and re-running the amd proprietary package '.run' with the '--force' option from a root text mode shell.

This fix has now helped me multiple times as it seems to me that the slightest touch to X/compiz/kernel creates problems when using the proprietary drivers.