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<th>Priority</th>
<td>medium
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - PulseAudio crash caused by automatic deactivation of dedicated GPU's soundcard via vgaswicheroo"
href="https://bugs.freedesktop.org/show_bug.cgi?id=83446">83446</a>
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</tr>
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<th>CC</th>
<td>lennart@poettering.net
</td>
</tr>
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<th>Assignee</th>
<td>pulseaudio-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>PulseAudio crash caused by automatic deactivation of dedicated GPU's soundcard via vgaswicheroo
</td>
</tr>
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<th>QA Contact</th>
<td>pulseaudio-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Reporter</th>
<td>paul@konecny.at
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Component</th>
<td>alsa
</td>
</tr>
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<th>Product</th>
<td>PulseAudio
</td>
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<p>
<div>
<pre>Hi,
I'm using a HP EliteBook 850 G1 with Intel HD 4400 / AMD Radeon HD 8750M hybrid
graphics on the mesa drivers respectively.
After using Pulseaudio with a Linux Kernel version greater than 3.12 the sound
system hangs as it tries to access the dedicated GPU's integrated soundchip
which is deactivated alongside the GPU by the means of run-time power
management (
<a href="http://lists.freedesktop.org/archives/dri-devel/2013-September/045650.html">http://lists.freedesktop.org/archives/dri-devel/2013-September/045650.html</a> )
This feature was enabled by default as of Kernel 3.13.
It seems that Pulseaudio does not recognize that the soundcard on the radeon is
no longer available and tries to access it, which it can't.
I already filed a bug at launchpad which can be found here:
<a href="https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1310260">https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1310260</a>
Four other people are affected but unfortunately Canonical didn't pick up this
bug report. Raymond already did some basic analysis on the logs.
This problem still persists on Arch Linux, with the latest updates applied so I
don't believe it to be a distribution specific problem.
Dominik on the launchpad bugreport proposed a functioning workaround by
inserting "options snd-hda-intel enable=0,1,0" in /etc/modprobe.d . As this
effectively kills my HDMI Audio it is obviously not an optimal solution.
If you need anything please let me know.
I can set up a testing system on a dedicated SSD to tackle this problem. Please
let me know which system you would prefer.
I hope I did everything right as this is my first bug report on
freedeskttop.org
Best regards and thanks in advance!</pre>
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