I was able to stop the flickering with my Samsung SyncMaster 214T (connected
via DVI) and the X4500HD.
xrandr --verbose lists two modes for 1600x1200. Using the "preferred" one
(which is selected automatically on startup) causes flickering, using the other
one has worked fine for the last 40 minutes.
Relevant lines from xrandr --verbose:
1600x1200 (0x49) 162.0MHz +HSync +VSync +preferred
h: width 1600 start 1664 end 1856 total 2160 skew 0 clock 75.0KHz
v: height 1200 start 1201 end 1204 total 1250 clock 60.0Hz
1600x1200 (0x4a) 161.0MHz -HSync +VSync *current
h: width 1600 start 1704 end 1880 total 2160 skew 0 clock 74.5KHz
v: height 1200 start 1201 end 1204 total 1242
Mode 0x4a works without flickering.
** Attachment added: "Output of xrandr --verbose"
http://launchpadlibrarian.net/19795337/xrandr_verbose
--
[Intrepid] Screen flicker/resync on X4500HD
https://bugs.launchpad.net/bugs/275152
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