Very odd problem: Only getting an output to my screen, when running xine

[Hendrik Friedel]

Hello,

I have a very odd problem with my new TV.
I only get an output to it, when runnig xine or vdr-sxfe, which is a 
xine based frontend to VDR.
As soon, as I stop xine, the TV shows "LG, No Signal".
I can start nvidia-settings then, but it does not show up. Still I get 
"LG, No Signal". Only, when I don't stop xine, and start nvidia-settings 
(or any other X application) on top of xine, I see the application.

This is odd already. But it get's better. The output of xrandr does not 
change between the two (working/not working) states:
  xrandr --verbose
Screen 0: minimum 800 x 600, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 (0x12a) normal (normal) 0mm x 0mm
         Identifier: 0x129
         Timestamp:  22991
         Subpixel:   unknown
         Clones:
         CRTC:       0
         CRTCs:      0
         Transform:  1.000000 0.000000 0.000000
                     0.000000 1.000000 0.000000
                     0.000000 0.000000 1.000000
                    filter:
   1920x1080 (0x12a)  103.7MHz *current
         h: width  1920 start    0 end    0 total 1920 skew    0 clock 
  54.0KHz
         v: height 1080 start    0 end    0 total 1080           clock 
  50.0Hz
   1920x1080 (0x12b)  105.8MHz
         h: width  1920 start    0 end    0 total 1920 skew    0 clock 
  55.1KHz
         v: height 1080 start    0 end    0 total 1080           clock 
  51.0Hz
   800x600 (0x12c)   25.0MHz
         h: width   800 start    0 end    0 total  800 skew    0 clock 
  31.2KHz
         v: height  600 start    0 end    0 total  600           clock 
  52.0Hz


The problem does not occur, when I use VGA instead of HDMI. The xrandr 
output:
  xrandr --verbose
Screen 0: minimum 320 x 240, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 (0x12a) normal (normal) 0mm x 0mm
         Identifier: 0x129
         Timestamp:  1630366
         Subpixel:   unknown
         Clones:
         CRTC:       0
         CRTCs:      0
         Transform:  1.000000 0.000000 0.000000
                     0.000000 1.000000 0.000000
                     0.000000 0.000000 1.000000
                    filter:
   1920x1080 (0x12a)  124.4MHz *current
         h: width  1920 start    0 end    0 total 1920 skew    0 clock 
  64.8KHz
         v: height 1080 start    0 end    0 total 1080           clock 
  60.0Hz

My setup:
The Mainboard is a Asus M3n78-EM. The GPU is a Nvidia 8300.
It does not matter, whether I use vdpau or not for the xine output.
The xorg.conf, that I use can be found here: 
http://wbreu.htpc-forum.de/downloads/xorg.confsinglescreen

Attached a log with logverbose 6.

I would greatly appreciate any help.

Greetings,
Hendrik
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