AMD Is Disabling DPM Support For RV770 GPUs
AMD's Alex Deucher sent out a patch on Friday to disable Dynamic Power Management on the RV770 by default. The DPM for the RV770 was enabled by default with the Linux 3.13 kernel and it yields better/lower power consumption while idling, better performance if the video BIOS sets lower clock speeds at boot time, and with the lower power consumption can also come lower heat output. However, some users have reported issues with RV770 GPUs in using the Linux 3.13 kernel and newer. (In my personal testing of several different RV770 GPUs, I haven't encountered any issues with Linux 3.13+.)
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