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bbfa235
(Get the code!)
I've had similar problems getting VGA->Scart (PAL RGB) to work.
I have found one and only one way of getting a picture on my TV: add a PAL compatible mode in xorg.conf (not with xrandr), but make sure X starts with a non-interlaced mode on the VGA output (e.g. the automatically added 1024x768@60Hz VESA mode). This gives me an un-synced scrolling picture on the TV.
Then use xrandr to change to the PAL mode added in xorg.conf.
Any other procedure (starting X with the PAL mode set from the beginning or adding the mode with xrandr) just gives me a black screen (with sync if the mode I set is PAL compatible, without sync otherwise, but always just black). And the TV seems to display whatever it is sent even if it cannot sync to the signal, so it is probably sent a black picture by the graphics card.
When it works, the mouse pointer is shown in the wrong position on the TV: at half the y position compared to the correct position. (I.e. if I want to click something at the bottom of the TV screen I have to position the mouse pointer in the middle of the TV screen.) The mouse pointer is not visible in "black mode".
Using "X Window System Version 1.3.0" and xf86-video-