[Alsa-user] No sound on Dell XPS after suspend to RAM (ALC275)

[Neuer U. <aus...@gm...>]

Hello everybody

I hope I can get some help here.

My system is:
-------------

Dell XPS One 2710, Ubuntu 12.04, Kernel 3.2.0.31 or 3.2.0.32 or 3.6.2

The Problem is:
---------------

Sound works out of the box, until machine is suspended to RAM (STR).
After resume there is no sound at all.

Interestingly, a suspend to Disk (STD) and resume restores sound
functionality!

aplay -l:
Karte 0: PCH [HDA Intel PCH], Gerät 0: ALC275 Analog [ALC275 Analog]
  Sub-Geräte: 1/1
  Sub-Gerät #0: subdevice #0
Karte 0: PCH [HDA Intel PCH], Gerät 3: HDMI 0 [HDMI 0]
  Sub-Geräte: 1/1
  Sub-Gerät #0: subdevice #0

lsmod|grep snd:
snd_hda_codec_hdmi 32506 1
snd_hda_codec_realtek 79668 1
snd_hda_intel 34147 3
snd_hda_codec 135374 3
snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
snd_hwdep 13668 1 snd_hda_codec
snd_pcm 97661 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
snd_timer 29989 1 snd_pcm
snd 79391 13
snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer
soundcore 15091 1 snd
snd_page_alloc 18572 2 snd_hda_intel,snd_pcm

I tried to reload alsa modules to restore sound, but it is not possible
to unload or reload snd modules:

# sudo /sbin/alsa force-unload
Unloading ALSA sound driver modules: snd-hda-codec-hdmi
snd-hda-codec-realtek
snd-hda-intel snd-hda-codec snd-hwdep snd-pcm snd-seq-midi snd-rawmidi
snd-seq-midi-event snd-seq snd-timer snd-seq-device snd-page-alloc
(failed: modules still loaded: snd-hda-codec-hdmi snd-hda-codec-realtek
snd-hda-intel snd-hda-codec snd-hwdep snd-pcm snd-timer snd-page-alloc).

All information in the net that I found is unfortunately either
depreciated (using acpi_suspend) or refers to other chips that have
options (e.g. modprobe snd_hda_intel option=acer). It seems,
there is no documentation about options of the ALC275 chip available.

Anybody has a solution or a hint for me how to fix this?

Thanks

Michael