Comment 7 for bug 255561

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Peter Belew (peterbe) wrote : Re: dpkg-reconfigure xserver-xorg fails on Dell PowerEdge 400sc with ati and Samsung SyncMaster 570s

Here is /var/log/Xorg.0.log - there is an explanation of why the higher resolutions weren't used - but I don't quite understand that.

Look at the man pages for xrandr, dexconf, xorg.conf, etc.

Ubuntu started using a new version of xorg software very recently.