I have noticed that when playing recordings and videos, MythTV-light does not appear to change the display resolution/refresh rate when watching a video that is different from the default display mode. I have enabled the "Separate video modes for GUI and TV playback” setting in the menu.
One thing I notice is that xrandr does not appear to have any effect on the latest raspbian:
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$ DISPLAY=:0 xrandr --output default --mode 1920x1080 --rate 24
xrandr: Failed to get size of gamma for output default
$
However, the tvservice utility works perfectly:
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$ tvservice -e "CEA 32 HDMI"
$
This sets the new mode without issue. I would really like to enable this, as it would (I hope) result in judder-free playback for 24Hz material, and allow me to use my TV's deinterlacing capabilities (the RPi doesn't seem to have enough processing power to handle yadif) for interlaced broadcast recordings.
For reference, I am using a RPi 3 Model B running Raspbian 9, connected to a TV that definitely supports all the modes I'm trying, via an AV receiver.
Any ideas? Many thanks!