[Bug 23752] New: drm/radeon/kms -- hang during boot unless using "nomodeset"

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=23752

           Summary: drm/radeon/kms -- hang during boot unless using
                    "nomodeset"
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.37-rc3
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: linville@tuxdriver.com
                CC: rjw@sisk.pl
        Regression: Yes


Created an attachment (id=38212)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=38212)
lspci-info.txt

Boot hangs very early unless nomodeset is used.  No disk access is observed and
box never becomes available on the network.

The box is an HP 8530p laptop.  Normal functionality is restored by reverting
this patch:

commit bdd91b2b571c80dacfca88667d935f9907e62931
Author: Tyson Whitehead <twhitehead@gmail.com>
Date:   Mon Nov 8 16:08:30 2010 +0000

    drm/radeon/kms: fix bugs in ddc and cd path router code

    This is a follow on to:
    2b5b1d7da9583484b3a9e7e375a90ca0e8ca07c2
    (drm/radeon/kms: add support for clock/data path routers)

    That patch completed mux support for ddc and cd line routing
    between connectors.  This patch fixes an indexing typo that was
    resulting in the atom bios router objects not always being walked,
    ensures the validity entries for the reused router structure are
    reset for every connector object walked, and corrects the masking
    operations used to update the mux control bits.

    Fixes:
    https://bugs.freedesktop.org/show_bug.cgi?id=31339

    Signed-off-by: Tyson Whitehead <twhitehead@gmail.com>
    Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

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