[Bug 17986] New: [HD3870, HD3850] Blank screen on boot ( works with -vesa or -radeonhd)

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=17986

           Summary: [HD3870, HD3850] Blank screen on boot (works with -vesa
                    or -radeonhd)
           Product: xorg
           Version: 7.4
          Platform: All
               URL: https://bugs.edge.launchpad.net/ubuntu/+source/udev/+bug
                    /264462
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          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


Created an attachment (id=19506)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=19506)
Xorg.0.log

I'm forwarding this bug from a Ubuntu reporter:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/264462

Problem:
On booting the Ubuntu livecd, it comes up with a blank (black) screen when
trying to bring up the gdm login page.  Works okay with -vesa and -radeonhd. 
Two HD3870 users have confirmed seeing this issue; I could not reproduce it on
an HD3670.  One HD3850 (also RV670) user reported the same issue.  Disabling
DRI and experimenting with AGPMode settings had no effect (it's a PCIe card).


Tested:
Intrepid Alpha 3 (-ati 6.9.0-x, xserver 1.4.99.905-x) - Works properly
Intrepid Alpha 4 (-ati 6.9.0+git20080802.1f3eee36-x, xserver 1.4.99.906-x) -
Fails with issue
Intrepid Beta    (-ati 6.9.0+git20081003, xserver 1.5.1-x) - Fails with issue

Original Report:
"The xserver-xorg-video-ati driver version that is part of the 02 Sep daily
build (Ubuntu i386) fails to start the display during the boot sequence for
either the live desktop or direct install modes, resulting in a blank "X"
display. The text terminals are accessible, and if I edit xorg.conf to load
either the "vesa" driver or the "radeonhd" driver and restart the X terminal,
the display works normally.

If one then continues to install to hard drive the same behavior manifests on
that installation...the radeon (ati) driver fails to start, but either the VESA
or radeonhd drivers work as expected.

I am not sufficiently knowledgeable to be able to determine if the problem lies
with the ati driver, xrandr or the "X" subsystem. If it is any help, the
display and video adapter are properly detected, but when using the "ATI"
driver xrandr -q returns inappropriate mode data. Xrandr returns appropriate
mode data when using both the "vesa" and "radeonhd" drivers.

The display is an Apple Cinema HD 23 Inch and the video adapter is an ATI
HD3870.

Interpid Alpha-3 and earlier did not exhibit this problem. The 02 Sep daily was
the first of the Alpha-4 releases I attempted to use."


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