[Bug 77009] 24P playback video signal loss with latest DRI patches

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77009

--- Comment #4 from Christian König <deathsimple at vodafone.de> ---
(In reply to comment #2)
> Hi Christian. Thanks for your help.  They are not 100% the same.  I hope
> that I am not misleading you.  My, aplogies in advance, if it works out to
> be so.

No problem at all. It's still quite likely that my patch is the source of the
problem.

> xorg3.15, Kernel 3.13.7 vs. 3.14

We should just make sure that it is indeed the only change in the system and we
don't have an issue like two patches affecting each other or something like
that.

Beeing based on kernel 3.13.7 vs. 3.14 for the two versions sounds like we
should make that sure first.

> Tonight I will make a new build environment to test PURELY the
> patch/un-patch.  I am a bit new to building kernel Dri/Drm modules.  But I
> should be able to figure it out.

Let me know if you need any help.

> It might be that my LCD does not like 23.98?  Thanks.  I will post back with
> the results.
Might be, but I would rather guess that the PLL isn't stable enough any more
with my changes.

When the values get higher you usually get better matching results, but the
electrical signal also gets more unstable. Your LCD is probably just a bit
picky what signal it gets as input.

I've attached a patch that artifically limits the dividers and so might produce
better results. Please try it and report back if that changes anything.

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