[Bug 19843] New: [Radeon FireGL 9000 RV250] Blank screen when switching to lower resolutions in X

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=19843

           Summary: [Radeon FireGL 9000 RV250] Blank screen when switching
                    to lower resolutions in X
           Product: xorg
           Version: 7.3
          Platform: Other
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: high
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: bryce at canonical.com
         QAContact: xorg-team at lists.x.org


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]


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