Alsa - No sound on Dell Precision t1600

Hi , I have no sound output on my workstation.
In Alsamixer it just shows one option
and that would be to mute or unmute <S/PDIF>
$ lspci | grep -i 'audio'
Audio device: Advanced Micro Devices [AMD] nee ATI Cedar HDMI Audio [Radeon HD 5400/6300 Series]
$ lsmod | grep snd
snd_hda_intel 33946 0
snd_hda_codec_hdmi 27857 1
snd_hda_codec_realtek 62247 0
snd_hda_codec 101474 3 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_intel
snd_hwdep 6364 1 snd_hda_codec
snd_pcm 76956 3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
snd_page_alloc 7298 2 snd_pcm,snd_hda_intel
snd_timer 18687 1 snd_pcm
snd 58893 7 snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_hda_codec,snd_hda_intel
soundcore 5418 1 snd
$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
$ cat /proc/asound/cards
0 [Generic ]: HDA-Intel - HD-Audio Generic
HD-Audio Generic at 0xd0b40000 irq 43
$ cat /proc/asound/card0/codec\#0 | grep -i 'codec'
Codec: ATI R6xx HDMI
When i boot from a grml Live USB Stick
Alsamixer and sound seem to work out of the box
The Difference is that the card is recognized as HD-Audio-Generic in the Arch Install with Codec ARI R6xx HDMI
and when i boot from USB stick it is recognized as HDA Intel PCH with Codec Realtek ALC269VB and works
I googled arround and tried loading snd_hda_intel with different model options in /etc/modprobe.d/...
but nothing seems to work.
It would be nice if any of you have hint , how i can get the sound to work on my arch installation
Thanks in advance
Last edited by piefge (2013-04-15 12:59:57)

The problem is , i have no channels , there's only <S/PDIF> like i said
and unmuting it does nothing

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[ 19.315080] snd_hda_intel 0000:00:1b.0: irq 44 for MSI/MSI-X
[ 20.408741] input: HDA Intel Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input10
[ 20.408940] input: HDA Intel Line as /devices/pci0000:00/0000:00:1b.0/sound/card0/input11
[ 20.409100] input: HDA Intel Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input12
thanks for any advice!
Last edited by ondoho (2013-11-07 19:37:46)

so, is it possible to duplicate & reroute the default card's pcm or master channel back into the default card's Line channel (Line in)?
If you're talking about the analog audio path the answer is maybe. But fair warning, you'll be spending many more hours (maybe) getting it to work while wallowing real deep in today's integrated audio hardware and ALSA if you want to use this method.
the soundcard is a basic laptop intel chip.
This is the first thing you need to learn. That chip is generic and found on almost all modern x86 motherboards. Where the audio magic actually happens is the "codec" chip and the vendor/model varies. The HDA Intel chip merely "talks" to the codec chip which sits "behind" the HDA Intel chip on the bus.
So the first step is to figure out which codec chip is installed and then determine if you can "manually" connect the "virtual wires" inside the codec to make a connection from the output (play) to the input (capture).
One way that you might find which codec you have is to enter:
less /proc/asound/cardX/codec#Y
where "X" is your card number and "Y" is the codec number
Just look for "Codec:" near the top. Also, there's gobs of other good info in that file that will be used in a moment.
The codec chip contains what I call "virtual wires" that connect it's internal components (amplifiers, mixers, ADCs, DACs, etc). ALSA gathers info from BIOS and determines which connections to enable, but I've found that most codec chips have many connections that are not enabled. More importantly in this case, I've also found that many chips have a connection from the output (play) to the input (capture), it's just not enabled... and that may (or may not) also be the case for your chip. I've been able to enable the internal connections in my chips to create a hardware loopback so that Line Out is connected to Line In... so what you hear in the speakers is also sent to ALSA's capture interface... and the capture level is independently adjustable.
So how would you inspect and change these "virtual wires"? With a program called hda-analyzer. It will use the data in the /proc/asound directory (and more) to show you how your codec is wired in both text and graphics form, along with allowing you to change it. One way to get it is by running this command:
wget -O run.py http://www.alsa-project.org/hda-analyzer.py
I'll leave it to you to figure out which dependency packages need to be installed, but once you install them, run:
python2 run.py
where it will download yet more code (possibly in the /dev/shm directory) and will barf because you either need to install yet more dependency packages to run hda_analyzer.py, or simply because it tried to automatically run it using python3 (because it's also a python2 program, so run it manually like: "python2 hda_analyzer.py").
Once you get it running, the confusion factor will probably kick into high gear. Take your time and poke around. Get your bearings somewhat by clicking on "Graph" to display the wiring layout and hover your mouse over the square blocks and the wires. As I said in a previous post, if you can download the datasheet for your codec chip, it may help if it includes an internal diagram:
https://bbs.archlinux.org/viewtopic.php?id=147208
https://bbs.archlinux.org/viewtopic.php … 3#p1089243
Any changes you make to the "wiring" are instantaneous (so you can try it while making changes) and will go away on a reboot. Clicking "Exp" will create a python script of your changes that you can run later to make those connections again from the command line.
Good luck, and I'll check back to help if I can find the time... that is if you're up for such a major challenge.
Last edited by pigiron (2013-11-10 04:31:25)

Alsa - No sound on Dell Precision t1600

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