[Bug 71930] Kernel Bug and X fails to start when using radeon.runpm=1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71930

--- Comment #13 from sotiris papadimitriou <sotiris21papadimitriou at gmail.com> ---
Same problem.
My graphics cards:
lspci | grep VGA
01:05.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RS880M
[Mobility Radeon HD 4225/4250]
02:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Park
[Mobility Radeon HD 5430/5450/5470]
If radeon.runpm=0 all o.k.
If manually turning off the dGPU using switcheroo then freeze

Use Ubuntu 14.04 with 13.rc1

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