[Bug 63101] Hard lockup whel launching games like TF2 on kernels 3.11.5 and 3.12 rc4 and above if radeon.dpm=1 is used

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https://bugzilla.kernel.org/show_bug.cgi?id=63101

--- Comment #13 from Kertesz Laszlo <laszlo.kertesz@gmail.com> ---
I reverted commit 4076a65544e2de310cbf4eaadb13ee15bbfaaf4f, but still crashes
with dpm.

Reverting this commit changed back the CPU voltage handling as it was before.

It seems that the CPU power management is best for APUs in its latest form - if
dpm is not used or with 4076a65544e2de310cbf4eaadb13ee15bbfaaf4f reverted and
dpm activated, the CPU is scaled with voltages between 0.9 and 1.34, using all
frequencies, but if all cores are used, after a while the CPU becomes throttled
and the effective frequencies go down to around ~3 GHz or even lower, in some
cases even ~ 2GHz or lower (temps go as high as 60C withut dpm and ~56C with
dpm).

With the new code we have ~0.65 - 1.22 volts, the frequencies are maxed out at
3.168GHz (rarely 3.2) coupled with a lower max temperature(max 51C, mostly 49),
but the frequencies are stable, i can compile a kernel with 4 threads and there
is absolutely no throttling. Only thing is missing its the highest voltage
level (1.34) which enables turbo mode.

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