[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=91861

--- Comment #14 from Christian König <deathsimple at vodafone.de> ---
(In reply to Mike S. from comment #13)
> So, from your explanation, using a ref_div of 7 compared to 2, means that
> the VCO is running at a higher frequency, and hence, higher voltage. So I
> assume that would mean the GPU would be drawing more power & therefore run
> hotter, though I am not sure how significant this is to its overall power
> use.
> 
> Is that right?

No, just the other way around. A higher reference divider results in a lower
post divider and a lower feedback divider and that in turn results in a lower
voltage and lower power consumption.

But the over all power consumption of a PLL compared to the whole system or
even the GFX block is completely neglitable. I would guess something between a
1/1000000 and 1/100000 of a Watt compared to a couple of Watt for the whole
system.

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