Comment 24 for bug 284309

If autoconfiguration using EDID can not be done, the server will default to narrow sync ranges (30-37). In earlier version, the user would be asked during installation about monitor info, and the default answer would give a sync range of 30-50.

If the EDID from the monitor is broken or missing, the best we can offer is a user tool for configuring xorg.conf, which is work in progress.

Anyway, if somebody can try latest Jaunty and attach the logs (you can use "apport-collect 284309"), it would be nice.