Horizontal line issue -- some new thoughts

Hello there.
Regarding the horizontal lines / waves issue, has anyone else noticed that the intensity of the problem varies with the position on screen? The problem is especially visible in the upper left corner of my screen, yet is almost non-existent in the lower right corner. From the upper-left to the lower-right corner, the problem degrades. This is true for both the "lines" issue and the "waves" appearing.
You can try yourself by setting your desktop background to "Tile" and using (part of) the Crankycat picture (you can download a cropped version at http://siteffects.be/maarten/powerbook.png).
On my machine, the waves problem is very visible in the light-blue "Sources" area of iTunes (i.e. left part of iTunes, so coincidentally in the "worst" part of the screen). When moving the iTunes window to the right, the problem eventually disappears.
On a sidenote, has anyone tried to use the Powerbook with Linux? I'm really wondering whether a completely different operating system would solve the problem. I've tried using Ubuntu live CD's (both stable version and new "Dapper" version), but they do not seem to work. In general, I have the impression that you need kernel 2.6.15, which is the only one supporting the latest Powerbook.

Hi Sebastian,
When using sRGB (not IEC61966-2.1), I do see what you observe, however it is not THAT apparent.
Except. If I increase the contrast of the screen one notch (CTRLOption+Apple.), the heavy lines/wavy lines is very obvious. But if you increase contrast two notches they go away completely. Interestingly, on my dispaly, if you chose Generic RGB, and increase the contrast one notch, the whole orange panel shows heavy banding.
You can reduce back the contrast with (CTRLoption+Apple,)
Yes, the bottom right is less of a problem than the top left. But I can just about perceive the horizontal banding.
The same cannot be said of the horizontal pixel lines in the lilac panel. These only disappear if I increase the contrast so much that the display looks terrible. (e.g. until the lilac become almost pure blue). And the problem is the same everywhere on the screen.

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