[Bug 49981] On HD6850, Power Profile doesn't change if 2 screen is attached.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49981

--- Comment #36 from Alex Deucher <agd5f at yahoo.com> ---
Starting with kernel 3.11 you can enable the dynamic power management hardware
on the gpu by booting with radeon.dpm=1 on the kernel command line in grub. 
You will also need the latest smc firmware for your card.

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