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Ubuntu 15.10 (wily) reached end-of-life on July 28, 2016.
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I found the solution (!), create a new file /etc/modprobe.d/intel.conf
add the following options:
options snd-hda-intel single_cmd=1
options snd-hda-intel probe_mask=1
This fixed my problem. Meanwhile when I restart, it has very strange
cracking sound coming from laptop, not speakers. how can I
9.097217] snd_hda_intel :00:1f.3: azx_get_response timeout, switching to
polling mode: last cmd=0x000f
[ 10.101818] snd_hda_intel :00:1f.3: No response from codec,
disabling MSI: last cmd=0x000f
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