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]
Created attachment 22399 [details] [review] xrandr output
Created attachment 22400 [details] [review] Xorg.0.log_normalLogin
Created attachment 22401 [details] Xorg.0.log_loginAndSwitchTo800x600
Created attachment 22402 [details] regdump_broke.txt radeontool regmatch '*' > regdump_broke.txt xrandr --output LVDS --mode 1400x1050
Created attachment 22403 [details] regdump_good.txt radeontool regmatch '*' > regdump_good.txt xrandr --output LVDS --mode 800x600
Created attachment 29703 [details] Logs for the 6.12 branch. I also tested with the 6.12 branch (that I just compiled and installed today). The problem also appears here. Attached are the XOrg.log-files, the reg-dumps and the test-program that created the logs.
Created attachment 29705 [details] The Xorg.log in vesa mode All resolutions seem to work ok in Vesa mode. Attached is the xorg.log for reference when running in Vesa mode.
Is this still an issue with kms or a newer version of the driver?
(In reply to comment #8) > Is this still an issue with kms or a newer version of the driver? Unfortunately I can no longer test this. I already sold the affected laptop.
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