same problem here with an 7750, Ubuntu 11.10 and Catalyst 12.2 .
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Most of the 7XXX series of cards will not get official linux support until Catalyst 12.4. Some will come in 12.3 and some will come in 12.5/12.6.
I naively looked at the Windows driver release notes and assumed the same support carried over to the linux driver.
I'd like to strongly request AMD provide release notes for the linux driver like there are with the Windows drivers. Something that says what's supported and new features added for each driver release. Right now the most recent release notes are for 11.x something and don't really give any specific information.
...and when is 12.3 for linux expected?
I found some 8.59 linux drivers, clinfo reports my device but opencl programms dont run.