How to set mode to 1080p24 for HDTV

[Andy Furniss]

Frederik Vogelsang wrote:
> Hi,
>
> I am using an HDMI connection between my computer and my TV. For
> smooth playback of HD movies I need to set the mode of the TV to
> 1080p24. Unfortunately the radeon driver does not recognize this mode
> through the TV's EDID - only 1080p,1080p50 and 1080i are available. Is
> there a way to force 1080p24 somehow?

Look in Xorg.0.log the modes may be listed.

It may be better to startx/boot with the tv connected and on - it is 
possible they get listed turning on after but it was a bit random last 
time I tried.

If you can see the mode then just add it with xrandr, my tv is DVI-0 so 
I use -

xrandr --newmode "24p" 74.25  1920 2558 2602 2750  1080 1084 1089 1125 
+hsync +vsync
xrandr --addmode DVI-0 "24p"
xrandr --output DVI-0 --mode 24p