My pc is Dell Latitude E5470 and the original system version is 14.04LTS. When I upgraded to 16.04LTS, I could't hear voice. The following are pictures about my pc sound setting:
Can someone tell me what's the cause? Thank you!
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I am trying to fix a very similar issue http://askubuntu.com/questions/859849/no-sound-from-laptop-speakers-after-ubuntu-suspension. All I can say for the moment is that forcing shutdown (hold the power button) and restart seem to temporarily fix the problem. – Py-ser Dec 20 '16 at 11:59
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I did as you said，but it‘s still not working. BTW, my sys is UEFI booted. – louis lau Dec 21 '16 at 01:44
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I found something that worked for me with the same problem.
Go to System settings --> Software & Updates --> Additional drivers
When it shows you all drivers, in my case I had one checked from Intel Corporation: switch it off, by checking Do not use this device (or something similar).
Then reboot.
Credit: Fix Dummy Output (no sound) Problem in Ubuntu 14.04 Lts
It worked for me with a 16.04 version.
Py-ser
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Thanks for your reply. I've already switched from ubuntu to manjaro. – louis lau Nov 08 '17 at 05:58