[Bug 76490] Hang during boot when DPM is on (R9 270X)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76490

--- Comment #86 from Daniel Exner <dex+fdobugzilla at dragonslave.de> ---
Tried kernel 4.4.0-rc4 with 

"drm/radeon: load different smc firmware on some SI variants"

and 

"drm/radeon: print pci revision id as well as pci ids"

applied.

The good news: this kernel boots just fine:

[    3.120205] [drm] radeon kernel modesetting enabled.
[    3.135919] [drm] initializing kernel modesetting (PITCAIRN 0x1002:0x6810
0x1462:0x3036 0x00).

But if I remove line 2927 from drivers/gpu/drm/radeon/si_dpm.c the initial
problems return: boot fails.

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