Comment 5 for bug 573290

Also seeing this issue with a fresh Lucid install on
IBM T60 ThinkPad
ATI Radeon Mobility X1400
IBM/Lenovo 20" Monitor

For the external monitor in Lucid, setting refresh rates of either 70Hz or 72Hz results in an "Input signal out of range" message on the external monitor. In Karmic, either of those settings (as well as 60Hz & 75Hz) worked fine. Setting a 75Hz refresh rate shows less of the 'vibration' effect, but it's still quite bad.

I don't think this is particularly relevant, but the Lucid Monitor Preferences dialog identifies the external monitor as 'Lenovo Group Limited 20"', while the Karmic dialog identified it as simply as 'Lenovo 20"'.