[Bug 27663] New: Radeon Mobility 7500: Black screen/System hangs with KMS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27663

           Summary: Radeon Mobility 7500: Black screen/System hangs with
                    KMS
           Product: xorg
           Version: 7.5
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: dohny at gmx.de
         QAContact: xorg-team at lists.x.org


Created an attachment (id=35058)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=35058)
Xorg.0.log

Already filed a bug here: 
http://bugs.archlinux.org/task/19095

I'm using Arch Linux and had problems with screen artefacts in KDE (and only
KDE) when using my xorg.conf file. Without it, the artefacts are gone.

Additionally KMS does not work for me.
With KMS on "early start" (radeon driver build into kernel), the system hangs
after/during loading modules. 
radeon build into the kernel and using radeon.modeset=0 results in disabled
direct rendering (software rendering)

Using the "late start" of KMS (radeon not build into kernel) the system boots
all right, but it has a black screen after loading the modules (also in X).

What can I provide to help resolve this bug?

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