[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 #39 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to Tobias Droste from comment #35)
> 3) This card works fine with any sclk/mclk combination with the same vddc
> (1238mV) in windows and I can overclock there!

There is apparently some aspect of the set up that we are not programming
correctly that manifests with higher clocks on certain boards.

> 
> I'm also wondering why I get a different VBIOS size if I get the bios in
> windows (gpu-z) and linux. Is it because different firmware gets loaded? The
> (working) vbios under windows is twice as large as the linux one (see
> attachments).

The vbios is loaded from rom on the card.  The firmware for the various
micro-controllers on the GPU are loaded by the driver and are not part of the
vbios.  I'm not sure off hand why they differ.  Perhaps gpuz always returns a
128K image regardless of what size the actual bios is?  Or maybe it asks the
driver windows driver for a copy and the windows driver always stores 128K
images regardless of the actual image size.  I quick look at the tables and I
only see one small difference in the overdrive table:
-OD max sclk: 140000, max mclk: 162500 (win)
+OD max sclk: 107000, max mclk: 140000 (linux)
Everything else appears to be the same.  I'm guessing the windows driver
patched that and gpuz fetches the copy from the driver.

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