[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 #10 from Christian König <deathsimple at vodafone.de> ---
(In reply to Alex Deucher from comment #9)
> (In reply to Mike S. from comment #8)
> > Thanks for the explanation.
> > 
> > Can I suggest that you delay committing this patch for a week or so - I want
> > to check that it is really stable. Yesterday I had one incident where the
> > screen froze with diagonal coloured stripes for a couple of seconds, which I
> > have never seen before. It recovered itself OK without having to re-boot.
> > Could this have been caused by the higher divider values?
> 
> Probably not.  Usually PLL problems manifest themselves as no signal or
> periodic signal drop outs.  Keep in mind that prior to kernel 3.15, the
> driver used a different algorithm that had its own limitations.

Yeah, agree. For PLLs you usually know in a few minutes if your setup works or
not.

The only thing that could affect it a bit is the temperature, but then you are
driving the PLL so close to the edge that you will notice problems relatively
soon as well.

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