Guillaume -

That's the default xorg.conf file generated by recent versions of X in
Linux. Apparently the driver and display resolution is determined
without regard to that xorg.conf file.  However if settings for display
resolution and the driver are put into xorg.conf by editing it or using
an earlier version of Linux, then those setting are used, if they are
compatible with the display hardware.

What I have done is to run an earlier version of Linux, such as the 5.04
version  of Ubuntu, save the xorg.conf which is generated, and copy some
display and monitor settings from that file into the default xorg.conf.
In the older versions of Linux, the user manually makes some selection
of the display type and desired resolution - but new versions are trying
to make that selection automatically, which is a problem!

With the Samsung SyncMaster, it is apparently difficult for the software
to detect the monitor's capabilities, so the driver has to set up some
settings which work in most monitors. This much seems to be working in
the 9.04 beta and RC releases, but not perfectly, since sometimes the
resolutions chosen are too high or too low.

-- 
dpkg-reconfigure xserver-xorg fails on Dell PowerEdge 400sc with Samsung 
SyncMaster 570s
https://bugs.launchpad.net/bugs/255561
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