Comment # 4 on bug 1003812 from Takashi Iwai

Please give alsa-info.sh output.  Run with --no-upload option and attach the
output to Bugzilla.

Judging from your description, I guess the hardware is either Haswell or
Broadwell?  If yes, you have HDMI/DP controller as the primary and the analog
I/O controller as the secondary.  That's often problematic when you don't use
PulseAudio.

At first, try to put
  options snd-hda-intel index=1,0

to /etc/modprobe.d/50-hda.conf, and reboot.  This will swap the device
assignments, so that the first one will be the analog I/O.