When I installed 11.9 from amd download (the .run thing) thing went way wrong. I`m sure that with fglrx-updates they will release an update for 11.9 and later when it will be sufficiently tested.
If you just want to go to open-source drivers, then
install synaptic and remove any fglrx package installed.
There should be two packages installed:
1) fglrx and
2) fglrx-amdcccle
or their *-updates counterparts if you got them installed,
Finally your system should fall back to the kernel provided open-source driver.
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