[Bug 58021] New: [BISECTED] nouveau, nv50: External VGA not detected anymore

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https://bugzilla.kernel.org/show_bug.cgi?id=58021

           Summary: [BISECTED] nouveau, nv50: External VGA not detected
                    anymore
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.7.0-rc4+ - 3.9
          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: wippbox@gmx.net
        Regression: No


Created an attachment (id=101211)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=101211)
dmesg for last good commit

I have a lenove thinkpad T61p with a NVIDIA Corporation G84GLM [Quadro FX
570M].
When connecting my external VGA monitor my monitor is no more detected
properly:
> cat /sys/class/drm/card0-VGA-1/status
gives now "disconnected"

Last good commit is
ef22c8bb7b3fac45919b7fde412d36d1a8367d51
drm/nv50/disp: call into core to handle dac/sor power state changes

First bad commit is
7ebb38b556485449bfaa506a196439f6a6fd6ebd
drm/nv50/disp: call into core for dac load detection

The responsible function is
nv50_dac_detect in drivers/gpu/drm/nouveau/nv50_dac.c (moved to
drivers/gpu/drm/nouveau/nv50_display.c in more recent kernels).

Also tried a 3.9.1 kernel. The problem still remains.

However, replacing nv50_dac_detect with the corresponding version from the last
good commit fixed the problem (tried a 3.8.10 kernel).

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