[Bugme-new] [Bug 13422] New: Commit 295f83e7aaa87d52b8d16077225a90dab61df45a breaks framebuffer on PowerMac12.1

[bugzilla-daemon at bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=13422

           Summary: Commit 295f83e7aaa87d52b8d16077225a90dab61df45a breaks
                    framebuffer on PowerMac12.1
           Product: Platform Specific/Hardware
           Version: 2.5
    Kernel Version: >2.6.24 up t current git
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PPC-64
        AssignedTo: anton at samba.org
        ReportedBy: supp at kpo.zcu.cz
        Regression: Yes


Created an attachment (id=21683)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=21683)
lspci -vvv

I acquired PowerMac12,1 and installed gentoo on it, using vanilla kernel from
kernel.org

No matter if you use radeonfb or ofonly  FB screen hangs shortly after start
(machine is working though and can be accessed via ssh). Screen is just plain
dead.

Bisecting current git lead to commit 295f83e7aaa87d52b8d16077225a90dab61df45a
by Benjamin Herrenschmidt, named [PATCH 13/13] [POWERPC] Clear pci_probe_only
on 64 bits PowerMac.

After this commit FB was always dead no matter what.

Reverting this commit lead to fully functioning FB with all affected kernels,
eg. everything >=2.6.25-rc1.

It should be noted that dmesg is same with and w/o this error. 

If needed I can do more tests.

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