[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 #75 from Maxim Sheviakov <mrader3940 at gmail.com> ---
(In reply to Maxim Sheviakov from comment #74)
> (In reply to Maxim Sheviakov from comment #73)
> > (In reply to Alex Deucher from comment #72)
> > > (In reply to Maxim Sheviakov from comment #71)
> > > > Hmm, nice point. By the way, is the MCLK kinda divided by four? So, if
> > > > Memory Clock is 5600MHz, I'll have to do 5600/4*10000 to get the correct
> > > > value? It's like, 120000 value = 1.2GHz*4 = Original frequency = 4800MHz,
> > > > right? If that's it, I'll fix my quirk (AGAIN, LOL) and try using 970MHz and
> > > > 5600MHz written as needed, 'cause my GPU is MSI R7 370 Armor 2X, and looks
> > > > like values in quirk are *kinda* low for it.
> > > 
> > > The mclk values are the actual mclk values.  GDDR5 is quad pumped so you get
> > > 4x effective data rate per clock.  That might be what you are thinking of.
> > 
> > Looks like I get it now. Today I'll try to play with those values and
> > experiment with MCLK values, maybe with GPU clock too; if it's good, I will
> > let everyone know.
> 
> So right now I'm building a test kernel based on Linux Zen 4.3. Changed
> values in my line: from "{... 0, 120000}," to "{... 97000, 140000}", so that
> GPU clock is 970MHz and Memory clock is 1.4GHz aka 5.6GHz. Will let you all
> know if I succeed in that.

Nope, the system is unusable after Plymouth tries to start. Even with 1.3GHz.
Looks like it's a dpm error, as on Windows the card is really stable. with
those values, even if it's a bit overclocked.

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