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AMD Has Massive Radeon Patch Set - Power Management!
Not sure what you meant. Current code already sets my (desktop) card to the "cool and quiet" power state, so clock gating wouldn't change much. I need/want the driver to switch my card to the higher-performing power state(s) in the "3d_perf" class (with max clocks and voltage) when required.
Clock gating disables the clock signals to unused hardware blocks completely if they are not in use. This can make a big difference in terms of power consumption, even compared to a low clock. The old PM code wasn't capable of clock gating at all.
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.
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.
This laptop I'm using is an Evergreen card (HD5400 CEDAR if this counts as an Evergreen) and everything works just fine...
You have the appropiate firmware for your card, yes?
Yes everything is set up correctly. Actually I'm the one who explained it to you, how to set this up, so if it is working for you, it should be working for me :-D
DPM and UVD are initialized without errors (dmesg).
UVD is working but stopping UVD playbacks and switching back to a non-UVD power state is locking up the PC sometimes.
DPM does nothing until UVD is used. There it correctly switches power states and power level until the playback ends. After that the power level goes back to power level 2 and stays there.
while an early try with drm-next-3.11-wip worked (but was slow-ish),
latest drm-next-3.11 @f4dec318 gives a flash of garbled output
then black screen, as soon as drm loads. Kernel crash.
Nothing about the crash is logged on disk after reboot.
PC is imac12,2, efi-booted.