Comment 44 for bug 1246929

are there any way to select alsa as backend ?

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/plain/Documentation/sound/alsa/HD-Audio.txt

card 0: SB [HDA ATI SB], device 2: ALC892 Alt Analog [ALC892 Alt Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

for a desktop , you can enable independent headphone by specify hint in early patching to use alt analog device 2 for playback and capture (DAC_DEV=hw:0,2 and ADC_DEV=hw:0,2)

- indep_hp (bool): provide the independent headphone PCM stream and
  the corresponding mixer control, if available