For me it's the other way around: It's always at full speed.
The only change I noticed is when running UVD, but this results in a hard (or soft? changing VT doesn't work but SysRq+REISUB reboots the machine) lock after a few seconds.
/edit:
This is with 7982128c3d447df27db963af67bc6b8dc7efb1de from the drm-next-3.11 branch but the commits after that doesn't seem to change any behavior for evergreen cards.
The only change I noticed is when running UVD, but this results in a hard (or soft? changing VT doesn't work but SysRq+REISUB reboots the machine) lock after a few seconds.
/edit:
This is with 7982128c3d447df27db963af67bc6b8dc7efb1de from the drm-next-3.11 branch but the commits after that doesn't seem to change any behavior for evergreen cards.
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