Ubuntu: Sound card not found 16.04



Question:

I have the Acer Aspire E5-575G where no sound card is found with aplay -l

I have also added myself in audio group and reinstalled modules with

sudo aptitude --purge reinstall linux-sound-base alsa-base alsa-utils linux-image-`uname -r` linux-ubuntu-modules-`uname -r` libasound2   

The problem though seems to be deeper. From that moment I upgraded kernel from 4.4 to 4.8 without any result.

From lspci | grep "Audio" I get

00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21)  

and this is my /sbin/lsmod | grep snd output

snd_seq_dummy          16384  2  snd_soc_skl            65536  0  snd_soc_skl_ipc        40960  1 snd_soc_skl  snd_soc_sst_ipc        16384  1 snd_soc_skl_ipc  snd_soc_sst_dsp        28672  1 snd_soc_skl_ipc  snd_hda_ext_core       28672  1 snd_soc_skl  snd_soc_sst_match      16384  1 snd_soc_skl  snd_soc_core          233472  1 snd_soc_skl  snd_compress           20480  1 snd_soc_core  ac97_bus               16384  1 snd_soc_core  snd_pcm_dmaengine      16384  1 snd_soc_core  snd_hda_intel          36864  0  snd_hda_codec         135168  1 snd_hda_intel  snd_hda_core           81920  4 snd_hda_intel,snd_hda_codec,snd_hda_ext_core,snd_soc_skl  snd_hwdep              16384  1 snd_hda_codec  snd_pcm               110592  7 snd_hda_intel,snd_hda_codec,snd_pcm_dmaengine,snd_hda_ext_core,snd_hda_core,snd_soc_skl,snd_soc_core  snd_seq_midi           16384  0  snd_seq_midi_event     16384  1 snd_seq_midi  snd_rawmidi            32768  1 snd_seq_midi  snd_seq                65536  9 snd_seq_midi_event,snd_seq_dummy,snd_seq_midi  snd_seq_device         16384  3 snd_seq,snd_rawmidi,snd_seq_midi  snd_timer              32768  2 snd_seq,snd_pcm  snd                    86016  12 snd_compress,snd_hda_intel,snd_hwdep,snd_seq,snd_hda_codec,snd_timer,snd_rawmidi,snd_seq_device,snd_soc_core,snd_pcm  soundcore              16384  1 snd  

My knowledge in Linux is relatively small and I do not know what to do next. There is no difference with the live CD. Thanks for any input.

UPDATE

It was solved with fresh install. Current output with lspci -nnk | grep -A2 Audio

Audio device [0403]: Intel Corporation Device [8086:9d71] (rev 21)    Subsystem: Acer Incorporated [ALI] Device [1025:1094]    Kernel driver in use: snd_hda_intel  

The issue appears on some occasions, I will try to reproduce. It is fixed though if I shutdown and start over my system. Not on restart.


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