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I have a CRT monitor (1280x1024@85Hz) and LCD (1920x1200@60Hz) in dual
head configuration. In `Monitor Preferences` I have both monitors (in
Karmic these monitors were identified, after upgrade to Lucid both are
Unknown). I can setup both monitors to have correct resolution and
frequencies, everything works ok until I power off the CRT monitor for
some time. After I power on the CRT monitor, this monitor has often 60Hz
and I have to setup 85Hz again with System->Monitor Preferences. In
Karmic was the same behaviour, but it occured rarely. After upgrade to
Lucid, it occures after some minutes or tens of minutes the CRT is
powered off (I didn't found some pattern yet, first I thought that it
happens after some inactivity and activating sleep mode, but this
happened even I watched a movie with CRT off, there was no sleep mode
between off and on).

AFAIK since Karmic, there is no need to configure xorg.conf, I changed
there nothing (not in Karmic, not in Lucid), here is current xorg.conf
content (interesting these 1205px instead of 1200):

Section "Screen"
        Identifier      "Configured Screen Device"
        Device  "Configured Video Device"
        DefaultDepth    24
        SubSection "Display"
                Virtual 3200 1205
        EndSubSection
EndSection

Section "Module"
        Load    "glx"
EndSection

Section "Device"
        Identifier      "Configured Video Device"
        Driver  "fglrx"
EndSection

I don't know if it is in fglrx, xorg, gnome or whatever, so if you need
more informations, I will provide. Thanks

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: gnome-control-center 1:2.30.1-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic x86_64
NonfreeKernelModules: fglrx
Architecture: amd64
Date: Mon May 24 11:35:23 2010
ExecutablePath: /usr/bin/gnome-display-properties
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: gnome-control-center

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug lucid
-- 
Dual monitors (CRT+LCD) refresh rate problem
https://bugs.launchpad.net/bugs/584893
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