For -intel especially, displayconfig-gtk doesn't work very well. The
new Screen Resolution applet should be much better (although see
https://wiki.ubuntu.com/X/Config for remaining manual configuration
steps required.)
Also, displayconfig-gtk is being deprecated - see
https://wiki.ubuntu.com/X/Di
displayconfig-gtk:
Installed: 0.3.7build1
Candidate: 0.3.7build1
Version table:
*** 0.3.7build1 0
500 http://de.archive.ubuntu.com hardy/main Packages
100 /var/lib/dpkg/status
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=8.04
DISTRIB_CODENAME=hardy
DISTRIB_DESCRIPTION="Ubuntu hardy (de
