Comment # 20 on bug 968744 from Takashi Iwai

Thanks.  So this seems caused by the upstream fixes for Realtek COEF setups
that have been backported to openSUSE 13.2 kernel.  It's interesting why only
13.2 kernel suffers while TW kernel works...

In anyway, try to install hda-verb from OBS multimedia:libs
 
http://download.opensuse.org/repositories/multimedia:/libs/openSUSE_13.2/x86_64/

Then run it like below as root:
  hda-verb /dev/snd/hwC0D0 0x20 SET_COEF_INDEX 0x07
  hda-verb /dev/snd/hwC0D0 0x20 GET_PROC_COEF 0

Show the returned value.  Then enable the bits 0x2030 to that value (e.g. if it
was 0x0110, it'll be 0x2130), and write it back:
  hda-verb /dev/snd/hwC0D0 0x20 SET_COEF_INDEX 0x07
  hda-verb /dev/snd/hwC0D0 0x20 SET_PROC_COEF XXX

where XXX is the value you update (0x2130 in the example above).