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I've got a Hewlett Packard L1940T. It was flickering both in Vista and Linux. The flicker was so annoying that I was going to send the monitor back.
The monitor is not, I suppose, of the highest spec and the manufacturers recommended resolution is 1280 x 1024 @ 60 Hz.
I figured that playing with xorg.conf, the file that configures the video display might help. These settings stopped the flickering:
Section "Monitor"
Identifier "Generic Monitor"
Option "DPMS"
HorizSync 60
VertRefresh 43-60
EndSection
Unfortunately, with these settings, some of the fonts became slightly blurry. I can live with that, but the flickering was driving me bananas. It still flickers in Vista, but in Linux it's fine.