[Bug 64904] New: [BISECTED] nouveau, nv50: External VGA not detected anymore - bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ

From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org
To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [Bug 64904] New: [BISECTED] nouveau, nv50: External VGA not detected anymore
Date: Thu, 23 May 2013 10:01:46 +0000	[thread overview]
Message-ID: <bug-64904-8800@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=64904

          Priority: medium
            Bug ID: 64904
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
           Summary: [BISECTED] nouveau, nv50: External VGA not detected
                    anymore
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: wippbox-hi6Y0CQ0nG0@public.gmane.org
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

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"

I bisected the kernel sources from
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
and filed a bug report at https://bugzilla.kernel.org
(https://bugzilla.kernel.org/show_bug.cgi?id=58021).

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 with a 3.8.10 and a 3.8.13 kernel).

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