sorry sound is not my playground

Please check the kernel log after suspend.

I guess simply reloading the driver via 'rcalsasound restart' would repair the sound, too.

Is it suspend to RAM or to DISK?

Also I need every detail of your laptop, as much as possible.

Takashi,

This happens after a normal startup, no suspend to disk or RAM involved. As it turns out, the Xen kernel seems to be much more consistent with the alsa driver then the non-Xen kernel. I also added my user name to the audio group after having read various threads about the potential benefits of it on the opensuse mailing list. However, just now I booted into the standard kernel and sound was not working. It started working with rcalsasound restart but after calling that a few times, it stopped again and no matter what I tried, I couldn't get it to work again. I then rebooted into the xen-kernel and voila, I have sound again.

I'll attach the output of lspci -v and dmesg which I hope is as much information as you need. In short it's a Gateway lapto with Intel Duo T2500 processor,945GM and 2GB of RAM. 

Created attachment 110419 [details]
lspci

Created attachment 110420 [details]
dmesg

I probably jinxed it now with the Xen kernel as it just stopped working with that kernel, too. And this time the sound remains silent even after rcalsasound restart and alsaconf...

I don't see any critical error messages in the attached kernel log, so it's more likely an application side error.  (Most of HD-audio errors come from IRQ mishandling, resulting in 'azx_get_response timeout' messages.)

Make sure that the mixer is unmuted and adjust when it happens.
Try a simple program as tests, such as
    % aplay -vv /usr/share/sounds/alsa/test.wav

Takashi,

The mixer settings are actually quite interesting in this respect. Whenever the sound works Kmix shows only two channels (Master and PCM with both having a green light) and when it does not work Kmix shows 3 channels (Master and PCM and SPDIF). In the latter case Master and SPDIF have the green LED whereas PCM does not. I reckon that's the cause. As a case in point, I just restarted my laptop and had sound. I then called rcalsasound restart and lost the sound. I tried running alsaconf but that didn't restore the sound either. /var/log/messages was not particularly illuminating either:
<rcalsasound restart>

Dec 20 20:22:56 mobilix kernel: PCI: Enabling device 0000:00:1b.0 (0100 -> 0102)
Dec 20 20:22:56 mobilix kernel: ACPI: PCI Interrupt 0000:00:1b.0[A] -> GSI 22 (level, low) -> IRQ 225
Dec 20 20:22:56 mobilix kernel: PCI: Setting latency timer of device 0000:00:1b.0 to 64
Dec 20 20:28:55 mobilix su: (to root) swesemeyer on /dev/pts/2

<alsaconf>
Dec 20 20:29:01 mobilix kernel: ACPI: PCI interrupt for device 0000:00:1b.0 disabled
Dec 20 20:29:27 mobilix kernel: PCI: Enabling device 0000:00:1b.0 (0100 -> 0102)
Dec 20 20:29:27 mobilix kernel: ACPI: PCI Interrupt 0000:00:1b.0[A] -> GSI 22 (level, low) -> IRQ 225
Dec 20 20:29:27 mobilix kernel: PCI: Setting latency timer of device 0000:00:1b.0 to 64

Does that shed any more light on the situation? Do you need any output from any of the files in /proc/asound?

Just to clarify the above comment. There is no "LED" at all above the PCM channel, so I cannot mute/unmute it at all and moving the slider does not have any effect at all.

Not sure whether this adds anything but here is the output of
cat /proc/asound/card0/codec#0|head
Codec: SigmaTel ID 7634
Address: 0
Vendor Id: 0x83847634
Subsystem Id: 0x107b0461
Revision Id: 0x100101
Default PCM: rates 0x7e0, bits 0x0e, types 0x1
Default Amp-In caps: N/A
Default Amp-Out caps: ofs=0x1f, nsteps=0x1f, stepsize=0x05, mute=1
Node 0x02 [Audio Output] wcaps 0xd0401: Stereo
  Power: 0x0

It looks as if this bug is not only present in 10.2 but also in 10.1:
http://www.linuxquestions.org/questions/showthread.php?t=473423

It has also been reported on:
http://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg17745.html

in addition to comment 12, there is a difference between the contents of codec#0 when the sound is working and when it is not working
the bit that differs is in the following section:

working:
Node 0x06 [Audio Selector] wcaps 0x300901: Stereo
 Connection: 3
    0x02* 0x07 0x14

not-working:
Node 0x06 [Audio Selector] wcaps 0x300901: Stereo
 Connection: 3
    0x02 0x07* 0x14

(also see http://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg17777.html)

So is there any way to force it to use the settings that work?

Takashi,

Does this bug report

https://bugtrack.alsa-project.org/alsa-bug/view.php?id=2146

apply to my bug, too?

It looks pretty much like what I found. I guess that'll mean it's going to be fixed in 10.3?

Well, 2.6.20 kernel contains only a part of ALSA 1.0.14rc*.  So, it's possible that it's still unfixed.  But anyway, you can try the latest kernel package on FACTORY, which is already based on the latest 2.6.20-rc.

I downloaded 1.0.14rc2 yesterday, compiled and installed it and now I have shedloads of channels and 3 tabs in KMIX and what's more, sounds seems to be working fine so far.
I guess once 1.0.14 is part of the official OpenSUSE kernels this bug can be closed.

*** Bug 192884 has been marked as a duplicate of this bug. ***

Unfortunately, it'll take some time that all portion of ALSA 1.0.14 is taken into the upstream.  So far, only a part of them is in 2.6.20 kernel currently used for FACTORY.

The fix is on upstream, so resolved to LATER for now.

mass reopening all 10.2 LATER+REMIND bugs.

close all 10.2 LATER/REMIND bugs as WONTFIX. Reopen yourself if you still plan to work on it.