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

[bugzilla-daemon at freedesktop.org]

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

          Priority: medium
            Bug ID: 77009
          Assignee: dri-devel at lists.freedesktop.org
           Summary: 24P playback video signal loss with latest DRI patches
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: socalfisher at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Radeon
           Product: DRI

Created attachment 96854
  --> https://bugs.freedesktop.org/attachment.cgi?id=96854&action=edit
xrandr verbose and dmesg +/- problem

This patch [https://bugs.freedesktop.org/show_bug.cgi?id=76564] appears to have
broken my 24P playback which has been fine until now.  My set is a Sony KDL
40NX711 NTSC set, PC A4-3400 - HDMI to set for vid/audio stereo out speakers. 
Using Openelec- gotham nightlies (this patch is now comitted to OE-nightlies):
Playing 29.97i/59.94 plays fine enough (a few skips- why I am testing this
patch), 23.976 playback breaks the TV display- it starts to buzz then says "no
signal", I press stop and the menu/screen resumes at ~30P like normal.

"xrandr --output HDMI-0 --mode 1920x1080 --rate 23.98" - does the same thing,
lcd loses video signal and buzzes.

I am attaching the dmesg/xrandr --verbose logs w/ drm.debug=0xe both working
w/o patch and broken w/patch.

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