Comment 49 for bug 20283

Similar (or same) bug as I reported yesterday (sorry). The problem I had was a completely blank screen on installation of 7.04 on an HP/Compaq nw8240. X Server could not find any screens. Fixed with a few lines in /etc/X11/xorg.conf. I have no flickering.

https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/110543

Solved by adding Device/Driver="ati", setting HorizSync, VertRefresh, and DisplaySize to Monitor, and adding "1920x1200" to each of the Screen/Display/Mode lines:

Section "Device"
 Identifier "ATI Technologies Inc Radeon Mobility X700 (PCIE)"
 Driver "ati"
 BusID "PCI:1:0:0"
EndSection

Section "Monitor"
 Identifier "Generic Monitor"
 Option "DPMS"
 HorizSync 28-96
 VertRefresh 43-60
 DisplaySize 330 210
EndSection