I have been using my Acer Aspire 7540 with Ubuntu since 8.04 but this week my card AMD Radeon HD4250 (R880) lost its acceleration and my desktop has slowed to a crawl.
I am using the open source driver ( never bothered with catalyst), I have followed all the diagnostic threads found here previously with no luck.
Anybody have any pointers, its not in a blacklist I can see the only issue I can report is on boot there is a warning message about failing to load amd.bin microcode.
Tried all I know and been unable to get back my 3d accel.
Help is most appreciated, but its probably something stupid on my part.