Dual simulatenous output on single card not recognized
Hello,
I bought a laptop with integrated sound output (either to speakers or headphones), and a HDMI output. Attached is the output of `aplay -l`.
Under both PipeWire and PulseAudio, I only get a single output/sink (by default to the built-in output), but I can get simultaneous output to both: - under PulseAudio, by adding a `load-module module-alsa-sink device=hw:0,7` line to the config; - under PipeWire, by adding a profile to the card to enable both outputs, which correctly provides two outputs that work fine concurrently.
I was directed to this mailing list after the following discussion:
It's a kernel ALSA bug if SOF actually must contain enough data for
the driver to figure this out (or at least pass that data on to userspace to deal with it)
if [we are] right that hardware itself does not contain the required
data, then it can only be fixed in userspace via a card database
which is one thing to do, another would be maybe a heuristic rule
that attempts to guess if such cards with analog and digital sub-devices might be independent
Please tell me if more details are needed—it would be nice if hardware configurations like mine could be fully supported out of the box ^^
Cheers, ~ ISSOtm
On 11/28/21 7:28 AM, Eldred HABERT wrote:
Hello,
I bought a laptop with integrated sound output (either to speakers or headphones), and a HDMI output. Attached is the output of `aplay -l`.
Under both PipeWire and PulseAudio, I only get a single output/sink (by default to the built-in output), but I can get simultaneous output to both:
- under PulseAudio, by adding a `load-module module-alsa-sink
device=hw:0,7` line to the config;
- under PipeWire, by adding a profile to the card to enable both
outputs, which correctly provides two outputs that work fine concurrently.
I was directed to this mailing list after the following discussion:
It's a kernel ALSA bug if SOF actually must contain enough data for
the driver to figure this out (or at least pass that data on to userspace to deal with it)
if [we are] right that hardware itself does not contain the required
data, then it can only be fixed in userspace via a card database
which is one thing to do, another would be maybe a heuristic rule that
attempts to guess if such cards with analog and digital sub-devices might be independent
Please tell me if more details are needed—it would be nice if hardware configurations like mine could be fully supported out of the box ^^
You may want to run 'alsa-info' and provide a link to the uploaded results. It's hard to comment without any information on 'hardware configurations like mine'. Thanks.
On 29/11/2021 19:18, Pierre-Louis Bossart wrote:
You may want to run 'alsa-info' and provide a link to the uploaded results. It's hard to comment without any information on 'hardware configurations like mine'. Thanks.
Sorry, I thought the output of `aplay -l` would be enough. The results are here; http://alsa-project.org/db/?f=bc64421df5181d1ba3bdf157c40d06dd52a7224b
~ Eldred
On 11/30/21 1:44 AM, Eldred HABERT wrote:
On 29/11/2021 19:18, Pierre-Louis Bossart wrote:
You may want to run 'alsa-info' and provide a link to the uploaded results. It's hard to comment without any information on 'hardware configurations like mine'. Thanks.
Sorry, I thought the output of `aplay -l` would be enough. The results are here; http://alsa-project.org/db/?f=bc64421df5181d1ba3bdf157c40d06dd52a7224b
ok, so you have a CNL-H chipset and no digital mics, so the legacy HDaudio driver is used (not SOF w/ the DSP enabled).
There's nothing at the driver level that would prevent the use of independent outputs, such as built-in speakers and HDMI concurrently. You can verify this assertion by opening different terminals and trying
speaker-test -Dhw:0,0 -c2 -r48000
speaker-test -Dhw:0,3 -c2 -r48000 (use 0,7 8 9 10 as needed, depending on which device is tagged as connected to a valid HDMI output in the mixer 'Jack' status)
I am not sure though how the Gnome settings would let you do this. This seems like a user-space problem to me?
participants (2)
-
Eldred HABERT -
Pierre-Louis Bossart