[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

--- Comment #27 from Christian König <deathsimple@vodafone.de> ---
Created attachment 159331
  --> https://bugzilla.kernel.org/attachment.cgi?id=159331&action=edit
Testing patch.

(In reply to kb from comment #26)
> (In reply to Christian König from comment #25)
> > You could try to artificially limit ref_div_max or fb_div_max until you get
> > a stable signal once more. Maybe this will yield some more light on the root
> > cause of the issue.
> 
> Can you give me some details - how to do this?

Attached is a testing patch which adds an artificially upper limit to 400.0 for
the feedback divider (normal range 17.0-2048.0) and an upper limit of 13 for
the reference divider (normal range 2-15).

I suggest you start playing with the feedback divider values until you can
figure out the limits for your hardware. E.g. try 400 as in my patch first, if
that works raise it to 800 if that doesn't work go down to 600 again etc..

> 
> > > Do you think change of graphics card would resolve the issue?
> > 
> > Well, most likely yes.
> > 
> > But the new kernel seems to work better for some people, but has regressed
> > for you. So I would really like to create a solution that works for
> > everybody.
> 
> Right now I switched to catalyst which seems to work and allows me to use
> new kernel. But since apparently my card is "legacy" I had to downgrade to
> xorg server 1.12 :-|

Yeah, that's the problem I've got as well. The hardware isn't supported any
more so the whole documentation is not available.

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