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

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

--- Comment #9 from Alex Deucher <alexdeucher@xxxxxxxxx> ---
(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.

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