There are issues with ATI Radeon graphics cards and xserver 1.6 and/or 2.6.28
kernels.
See
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/293698 -
[RV280 9250] No signal to monitor in 8.04 unless NoDRI used
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/348332 -
[RV250][JAUNTY] X Freezes with Radeon driver EXA/XAA Composite
and https://bugs.launchpad.net/xorg-server/+bug/133192 - Blank screen or
distorted image because of wrong default AGPMode value
I also have ATI Radeon 9250 (RV280) and adding NoDRI in /etc/X11/xorg.conf
solved my blank-screen-after-boot issue:
Section "Device"
Identifier "Configured Video Device"
Driver "ati"
Option "NoDRI"
EndSection
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Ubuntu 9.04 RC shows nothing on screen at boot
https://bugs.launchpad.net/bugs/364057
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