Comment 9 for bug 311910

Forwarding this bug report from a Ubuntu reporter:
https://bugs.edge.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/311910

[Problem]
Black screen when switching to lower resolutions. Works ok on terminal screens or with vesa driver.

[Original Report]
Since the upgrade to Ubuntu 8.10, I can no longer switch to lower resolutions than 1400x1050 on my Dell Latitude D600 laptop when using the Open Source ATI Radeon driver in X. When switching to a lower resolution the screen goes black.

Lower resolutions work without problems on the terminal screens (CTRL+F1 to CTRL+F6), they also work without problems in X when using the vesa driver.

I tried adding the Option "NoDCC" to xorg.conf, but Xorg.0.log showed that this option was ignored. Adding the Option "IgnoreEDID" also didn't make a difference, but I'm also not sure if it was actually used.

Attached is my current xorg.log.

[lspci]
00:00.0 Host bridge [0600]: Intel Corporation 82855PM Processor to I/O Controller [8086:3340] (rev 03)
     Subsystem: Intel Corporation Device [8086:4541]
01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Radeon RV250 [Mobility FireGL 9000] [1002:4c66] (rev 01)
     Subsystem: Dell Device [1028:011d]