The flickering appears always for any pclk < 20, independent of screen
resolution or refresh rate.

I could reproduce with 2 different boards: 945GME and 82945G/GZ.

On the first one I had to add newmodes forcing the pclk >= 20 in order
to avoid the flickering:

xrandr --newmode "640x480_20" 20  640 664 720 800  480 483 487 500
xrandr --addmode TV1 "640x480_20"
xrandr --output TV1 --mode 640x480_20

On the 82945G/GZ the flickering wasn't appearing in any resolution so I
forced pclk <= 19.99 in order to get it flickering.

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https://bugs.launchpad.net/bugs/480220

Title:
  [i945] [i945][karmic] S-Video: PAL output is garbled

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