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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 --- - HDMI audio device only visible after rescan"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75985">75985</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>nouveau@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>HDMI audio device only visible after rescan
</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>
<tr>
<th>Reporter</th>
<td>jean-louis@dupond.be
</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>Driver/nouveau
</td>
</tr>
<tr>
<th>Product</th>
<td>xorg
</td>
</tr></table>
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<pre>Hi
I have a Dell XPS 15 laptop with Optimus.
It has the following NVIDIA card:
01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 540M]
(rev a1)
The HDMI output is working fine since some time now.
Only there is still an issue with the HDMI audio.
On Windows, and with `lspci -H1` it shows the following devices:
01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 540M]
(rev a1)
01:00.1 Audio device: NVIDIA Corporation GF108 High Definition Audio Controller
(rev a1)
But by default, the audio device isn't visible after a clean boot. So the HDMI
audio ain't working.
Now I've found some workaround to get it working.
- Start the system, and stop the display manager (lightdm/gdm)
- Load the nouveau module
- Remove the Nvidia card from the PCI bus (echo 1 >
/sys/bus/pci/devices/0000\:01\:00.0/remove)
- Rescan the PCI bus (echo "1" > /sys/bus/pci/rescan)
And there it is, the Audio device is visible now:
01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 540M]
(rev a1)
01:00.1 Audio device: NVIDIA Corporation GF108 High Definition Audio Controller
(rev a1)
Also dmesg shows the following:
[ 152.360864] input: HDA NVidia HDMI/DP,pcm=9 as
/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input18
[ 152.361210] input: HDA NVidia HDMI/DP,pcm=8 as
/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input17
[ 152.361415] input: HDA NVidia HDMI/DP,pcm=7 as
/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input16
[ 152.361592] input: HDA NVidia HDMI/DP,pcm=3 as
/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input15
So the device is loaded correctly.
Now if we start lightdm/gdm/whatever again, and login (which also starts
PulseAudio), the HDMI audio works correctly like it should :)
Some note:
If we do the rescan without nouveau module loaded, the workaround does not
work. So we need to have nouveau loaded to make the Audio device visible.
On first boot I get the following error:
[ 121.872253] nouveau 0000:01:00.0: enabling device (0006 -> 0007)
[ 121.872554] [drm] hdmi device not found 1 0 1
This might be related?
After the rescan, it shows the following:
[ 151.557038] [drm] Initialized nouveau 1.1.1 20120801 for 0000:01:00.0 on
minor 1
[ 151.557186] snd_hda_intel 0000:01:00.1: enabling device (0000 -> 0002)
[ 151.557253] hda_intel: Disabling MSI
[ 151.557274] hda-intel 0000:01:00.1: Handle VGA-switcheroo audio client
[ 151.557349] hda-intel 0000:01:00.1: Disabling 64bit DMA
[ 151.560778] hda-intel 0000:01:00.1: Enable delay in RIRB handling
[ 152.360864] input: HDA NVidia HDMI/DP,pcm=9 as
/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input18
[ 152.361210] input: HDA NVidia HDMI/DP,pcm=8 as
/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input17
[ 152.361415] input: HDA NVidia HDMI/DP,pcm=7 as
/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input16
[ 152.361592] input: HDA NVidia HDMI/DP,pcm=3 as
/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input15
[ 156.801404] hda-intel 0000:01:00.1: Disabling via VGA-switcheroo
Hopefully this can help getting the issue fixed completely :)
Thanks!
Jean-Louis</pre>
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