I now found out that by changing TV_FORMAT the frequency gets changed,
like it is supposed to, however the picture still stays b/w on my PAL
tv.
xrandr --output TV --set TV_FORMAT NTSC-M --auto
xrandr --verbose
....
TV_FORMAT: NTSC-M
....
1024x768 (0x7e) 26.9MHz
h: width 1024 start 1025 end 1088 total 1120 skew 0 clock 24.0KHz
v: height 768 start 769 end 800 total 801 clock 30.0Hz
xrandr --output TV --set TV_FORMAT PAL --auto
xrandr --verbose
....
TV_FORMAT: PAL
....
1024x768 (0x8a) 22.4MHz
h: width 1024 start 1025 end 1088 total 1120 skew 0 clock 20.0KHz
v: height 768 start 769 end 800 total 801 clock 25.0Hz
--
Can't set TV_FORMAT anymore using xrandr
https://bugs.launchpad.net/bugs/246802
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