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

[bugzilla-daemon@freedesktop.org]

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

--- Comment #99 from Maxim Sheviakov <mrader3940@gmail.com> ---
(In reply to Alex Deucher from comment #98)
> (In reply to Tobias Droste from comment #95)
> > Are you suggesting that Microsoft Windows 10 is delivering a different VBIOS
> > for your card then what was originally installed on the graphics card?
> > 
> > If so, who installs this? Windows itself? As far as I know is the driver
> > only loading some binaries inside the VBIOS, but not replacing it. Or is
> > this a new feature of the windows driver?
> 
> Neither Windows nor the Windows driver flashes a new vbios.  Flashing an
> arbitrary vbios is not recommended, may render your card useless, and may
> void your warranty.

Interesting, but it got flashed 0_0
Also, the problem is not in VBios or IDs. It's all about memory clock - setting
a value higher than 1.2GHz (in a quirk) makes the system hang after
Plymouth/before display server start. So, to my mind we have to do something
with DPM/PowerPlay code or make some userspace overclock support, as there's no
other way right now. By the way, is there such a tool that allows to overclock
memory of the card?

And yep, with its standard VBios card works with 1050MHz/1.2GHz (core/memory)
clocks. I'm using those SMC patches + new firmware. Maybe they should be sent
upstream, even to add that new firmware files and code to use them?

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