[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 #20 from Christian König <deathsimple at vodafone.de> ---
(In reply to comment #17)
> Created attachment 97006 [details]
> v3 patch merged with this max patch dmesg
> 
> I realized that the last patch I uploaded was v2 modded.  Here is dmesg with
> the newer v3 patch and this max patch (merged/applied as one patch). It
> works fine thus far, no blank screen.  

Garrett, please stop trying to merge the patches. Since the initial change is
already upsteram we are going to need to fix it in a separate patch anyway.

> 
> Test condition:
> 
> xrandr --output HDMI-0 --mode 1920x1080 --rate 23.98
> dmesg > /var/log/dmesg
> 
> [   31.834325] [drm:radeon_compute_pll_avivo] *ERROR* 14830, pll dividers -
> fb: 148.3 ref: 10, post 10

My fix limited the reference divider so that "post_div * ref_div <= 100". Could
you try to raise the 100 to see at which point your TV says the signal isn't
valid any more?

With a limit of 500 you should be at the same point as before, so I suggest to
try values of 200, 300, 400 first. Then if 200 works but 300 doesn't (for
example) try 250, and so on...

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