[Bug 90220] New: Black screen with KMS on powerpc iBook

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90220

            Bug ID: 90220
           Summary: Black screen with KMS on powerpc iBook
           Product: xorg
           Version: unspecified
          Hardware: PowerPC
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: dand1972 at yahoo.com
        QA Contact: xorg-team at lists.x.org

Created attachment 115416
  --> https://bugs.freedesktop.org/attachment.cgi?id=115416&action=edit
dmesg output

In Debian Jessie, I get a black screen booting with KMS enabled.  The backlight
remains lit, but the screen displays as black.  It happens on boot up about
when these lines appear:

[   16.797096] [drm] Initialized drm 1.1.0 20060810
[   18.117763] [drm] radeon kernel modesetting enabled.

>From then on I can log in blind, and I'm running pbbuttonsd so the brightness
keys can dim or brighten the screen, but it always remains black.  Switching to
a console also gives me a black screen.

Adding the kernel parameters video=offb:off radeon.modeset=1 radeon.agpmode=-1
changed nothing.

This isn't a new problem, I've had it in previous Debian releases, but I hope
someone might take a crack at this.  Right now the only workaround is to
disable KMS and work with a very slow desktop (and no mplayer or vlc fullscreen
upscaling).

This is on an G3 iBook (M8603LL/A - PowerBook4,3 - A1007)

Thanks,

Dan

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