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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [NVC1] HDMI audio device only visible after rescan"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75985#c82">Comment # 82</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [NVC1] HDMI audio device only visible after rescan"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75985">bug 75985</a>
from <span class="vcard"><a class="email" href="mailto:lukas@wunner.de" title="Lukas Wunner <lukas@wunner.de>"> <span class="fn">Lukas Wunner</span></a>
</span></b>
<pre>(In reply to Przemysław Kopa from <a href="show_bug.cgi?id=75985#c81">comment #81</a>)
<span class="quote">> (In reply to Daniel Drake from <a href="show_bug.cgi?id=75985#c80">comment #80</a>)
> > A patch titled "PCI: Enable NVIDIA HDA controllers" (effecively attachment
> > #137939 [details] [review]) is headed into linux-next and potentially Linux
> > 5.3. Testing appreciated!
>
> Hello there! This commit prevents vga_switcheroo from turning off dGPU
> (Geforce 540m) on my optimus machine as described here:
> <a href="https://bbs.archlinux.org/viewtopic.php?pid=1865512#p1865512">https://bbs.archlinux.org/viewtopic.php?pid=1865512#p1865512</a>. I never had
> problems with HDMI audio on this system - I think all connectors are
> connected to the Intel GPU, yet NVIDIA HDA is still enabled by this patch.</span >
If the HDA is kept runtime resumed, e.g. if it is accessed by a user space
application, then the GPU is kept runtime resumed as well.
Check the runtime PM status of the HDA:
grep . /sys/bus/pci/devices/0000:01:00.1/power/*
Check if user space applications have opened the HDA:
lsof /dev/snd/controlC1</pre>
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