https://bugs.freedesktop.org/show_bug.cgi?id=66963

--- Comment #33 from Scias <shining.scias@gmail.com> ---
Sorry I'm a bit late.
My tests are a little bit different from Sergey's.

Unpatched : 
Hangs 3/4 times - Unresponsive X - Setting battery state = corruption - "Frost"
flicker at modeset

No clockgating :
Same as unpatched

No voltage control :
Hangs everytime

No PCIE2 :
Hangs everytime

No dynamic spectrum :
Boots everytime - X is okay - Setting battery state is okay - "Frost" flicker
at modeset.

So clearly disabling the dynamic spectrum really helped for me.
Another finding is that setting radeon in the initramfs (for early KMS) results
in guaranteed hang except with disabled spectrum where it still boots
everytime.

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