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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 --- - Haswell: Muting S/PDIF turns off DP"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75729">75729</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>Haswell: Muting S/PDIF turns off DP
</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>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>consume.noise@gmail.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</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=95061" name="attach_95061" title="dmesg 3.13.4 (stock Arch kernel, booted with drm.debug=0xe)">attachment 95061</a> <a href="attachment.cgi?id=95061&action=edit" title="dmesg 3.13.4 (stock Arch kernel, booted with drm.debug=0xe)">[details]</a></span>
dmesg 3.13.4 (stock Arch kernel, booted with drm.debug=0xe)
This time it's not a bug with a ThinkPad nor a docking station involved, even
no laptop at all. But, again it's some DP vs. audio "issue".
I have just set up my new desktop at home. It's a Haswell i7-4770 sitting on a
Intel DH87RL board. A monitor (iiyama 27") is connected via DP. This monitor
has a massive sound system of 2x2W speakers build in, which I tested (this bug
report doesn't cover the audio quality).
So, the audio output via DP to the monitor played and I just tested to mute the
S/PDIF via alsamixer ... and the monitor turned off into standby, audio stoped.
Blindly typing another 'm' to unmute the S/PDIF and the monitor turned back on
and the audio playback proceeded.
If I don't play audio and mute the S/PDIF, the monitor stays active/on. Until I
start playing audio.
I've attached a dmesg log (drm.debug=0xe) of a boot to the console, where I
have played audio and muted the S/PDIF. Though, the log doesn't show anything
after the login. There's a "[drm:ivb_err_int_handler], Pipe A FIFO underrun" at
the end, but I don't think (...famous noob words) that this is related because
I've "turned off" the monitor via muting during this boot a couple of times and
this message doesn't show up.
How can provide any useful debug logs for this issue? (I guess: build a kernel
with alsa-debug options?)</pre>
</div>
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