Likely most notable from this latest DRM fixes series entering the Linux kernel is the microcode fixes for some newer graphics cards, mainly fixing up the dynamic power management support for the AMD Radeon R7 260X graphics card. Besides the microcode fixes to stabilize newer GCN-era hardware, there's also some run-time power management fixes, and PLL regression fixes for the Radeon driver. Hopefully this pull will fix a Radeon DRM problem previously mentioned on Phoronix during the early Linux 3.15 benchmarking. Many more Linux 3.15 kernel benchmarks are forthcoming on Phoronix.
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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