[Bug 101446] New: radeon does not pick up an X screen, modesetting does (r600, ppc, 2nd GPU)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101446

            Bug ID: 101446
           Summary: radeon does not pick up an X screen, modesetting does
                    (r600, ppc, 2nd GPU)
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: PowerPC
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: erhard_f at mailbox.org
        QA Contact: xorg-team at lists.x.org

Created attachment 131976
  --> https://bugs.freedesktop.org/attachment.cgi?id=131976&action=edit
xorg.log with "radeon" driver

My setup is a PowerMac 11,2 G5 with 2 graphic cards, a Nvidia GT6600 (1st
PCIe-slot, Mac-BIOS) and a Radeon 5450 (2nd PCIe-slot, x86-BIOS). I need the
Nvidia for the OpenFirmware bootmenu and booting the G5 up. I want to drive X
with the Radeon only. Which is possible using "modesetting", but not with
"radeon".

I needed "video=offb:off video=nouveaufb:off video=radeonfb:off
nouveau.modeset=0 radeon.modeset=1" as kernel boot parameter to get the
framebuffer on the Radeon running as /dev/fb0.

To get X running I needed this minimal /etc/X11/xorg.conf:
Section "ServerFlags"
    Option "AutoAddGPU" "false"    
EndSection

Section "Device"
    Identifier             "Card_x86"
    Driver                 "radeon"
#    Driver                 "modesetting"
    BusID                  "PCI:6:0:0"
EndSection

This setup works with modesetting picking up a screen. So I guess I am missing
some important detail, which modesetting generously overlooks or it's a bug of
the radeon driver.

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