[Bug 100871] New: radeon fails to initialize one DisplayPort monitor

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=100871

            Bug ID: 100871
           Summary: radeon fails to initialize one DisplayPort monitor
           Product: Drivers
           Version: 2.5
    Kernel Version: v3.19-7478-g796e1c55717e
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: cra at wpi.edu
        Regression: No

Ever since Fedora 21 was updated to kernel-4.x, the radeon drm driver fails to
initialize one DisplayPort monitor of a multi-monitor setup.  Setup is four
mini-DP ports on [AMD/ATI] Cedar GL [FirePro 2460], two Dell U2410 monitors
connected via DP, and two Dell 2001FP monitors connected via DVI using
DP-to-DVI adapters.

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cedar
GL [FirePro 2460] (prog-if 00 [VGA controller])
    Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Device 2002
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
    Latency: 0, Cache Line Size: 64 bytes
    Interrupt: pin A routed to IRQ 29
    Region 0: Memory at e0000000 (64-bit, prefetchable) [size=256M]
    Region 2: Memory at f7e20000 (64-bit, non-prefetchable) [size=128K]
    Region 4: I/O ports at e000 [size=256]
    Expansion ROM at f7e00000 [disabled] [size=128K]
    Capabilities: <access denied>
    Kernel driver in use: radeon
    Kernel modules: radeon

I did a git bisect between Linux v3.19-6676-g1fa185ebcbce and
v3.19-7478-g796e1c55717e and found:

# bad: [e55bca26188e45f209597abf986c87cc5a49894a] radeon/audio: enable DP audio
git bisect bad e55bca26188e45f209597abf986c87cc5a49894a
# first bad commit: [e55bca26188e45f209597abf986c87cc5a49894a] radeon/audio:
enable DP audio

commit e55bca26188e45f209597abf986c87cc5a49894a
Author: Slava Grigorev <slava.grigorev at amd.com>
Date:   Fri Dec 12 17:01:42 2014 -0500

    radeon/audio: enable DP audio

    Reviewed-by: Christian König <christian.koenig at amd.com>
    Signed-off-by: Slava Grigorev <slava.grigorev at amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

See also https://bugzilla.redhat.com/show_bug.cgi?id=1232562

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