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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [BISECTED] nouveau, nv50: External VGA not detected anymore"
href="https://bugs.freedesktop.org/show_bug.cgi?id=64904">64904</a>
</td>
</tr>
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<th>Assignee</th>
<td>nouveau@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[BISECTED] nouveau, nv50: External VGA not detected anymore
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>xorg-team@lists.x.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Reporter</th>
<td>wippbox@gmx.net
</td>
</tr>
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<th>Hardware</th>
<td>x86 (IA32)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>Driver/nouveau
</td>
</tr>
<tr>
<th>Product</th>
<td>xorg
</td>
</tr></table>
<p>
<div>
<pre>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:
<span class="quote">> cat /sys/class/drm/card0-VGA-1/status</span >
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 <a href="https://bugzilla.kernel.org">https://bugzilla.kernel.org</a>
(<a href="https://bugzilla.kernel.org/show_bug.cgi?id=58021">https://bugzilla.kernel.org/show_bug.cgi?id=58021</a>).
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).</pre>
</div>
</p>
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