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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 --- - DP monitor does not get activated when snd_hda_intel is loaded"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75710">75710</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org, tiwai@suse.de
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>DP monitor does not get activated when snd_hda_intel is loaded
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
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<th>Reporter</th>
<td>consume.noise@gmail.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=95024" name="attach_95024" title="dmesg 3.14-rc4 @ Lenovo T410 (+alsa-debug options and drm.debug=0xe)">attachment 95024</a> <a href="attachment.cgi?id=95024&action=edit" title="dmesg 3.14-rc4 @ Lenovo T410 (+alsa-debug options and drm.debug=0xe)">[details]</a></span>
dmesg 3.14-rc4 @ Lenovo T410 (+alsa-debug options and drm.debug=0xe)
I'm having a bug here, where the loaded hda (snd_hda_intel) module causes some
(timing?) problem resulting in a monitor connected to the DP not to get active.
I can reproduce this on a Lenovo X201 and T410 (Ironlake) sitting on a docking
station, which has a monitor (Dell U2410) connected to a DP.
First, I tried it on alsa-devel, but Takashi send me here.
Steps to reproduce:
1. boot with the laptop at the docking station and the monitor plugged in
2. start the X-Server
... output on LVDS and DP is okay
3. disable the DP: xrandr --output LVDS1 --preferred --output DP1 --off
... output on LVDS - okay
4. switch to DP: xrandr --output LVDS1 --off --output DP1 --preferred
... DP _usually_ doesn't gets active, it turns off into suspend state
If I boot a kernel _without_ the hda module step 4 always works. When having
the hda module loaded I need some luck and some iterations of step 3 and 4 to
activate the monitor at the DP.
I verified that the problem exists in kernel v3.13.1 and v3.14-rc4.
The dmesg I have attached has been created on the T410 with kernel v3.14-rc4
(enabled all alsa debug options I could find and booted with drm.debug=0xe).
I didn't attached an X-server log, it didn't showed any errors. But, if
requested I can create one with debug loggings enabled in xf86-video-intel
(2.99.910 was in charge during the test(s)).
Thanks in advance,
Daniel Martin</pre>
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