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Re: no sound on Lenovo Ideapad 110

Alsa seems to function correctly, so next you should assign available profile for your sound card with PulseAudio.
You should be able to choose between speakers\headphones outputs.
Install "pavucontrol" package or\and "kmix" package since you using kde.
Go to Configuration tab in pavucontrol and set profile for your sound card.

Console utility for that is "pactl". This will give you index number of your sound card.
    $ pactl list cards
This will set active profile for pulse audio on my system (You can use "Tab" key to get help for the next list of parameters):
    $ pactl set-card-profile 1 output:analog-surround-51+input:analog-stereo
Pulse audio should remember that selection, between system restarts.
If audio sink wasn't created after that, restart pulseaudio if necessary:
    $ pulseaudio -k
    $ pulseaudio --start

To check sound from pulseaudio:
    $ speaker-test -D pulse -c 2 -t wav

On 26.09.2017 15:37, Pierre Frenkiel wrote:
On Tue, 26 Sep 2017, Alexander V. Makartsev wrote:

Yes. It looks like sound card was detected and initialized, but Pulse
Audio was unable to set it as "default" automatically.
Have you tried to list and use available cards from alsa perspective
(your device names may be different)?

  I'm not sure that this is the problem, as the sound works correctly
  with the headphone, even with  speaker-test !
  I already tried with the different devices given by "aplay -L",
  and of course checked the output levels with alsamixer.
  for example: "speaker-test -Dsysdefault:Generic -c 2 -t sine"
  but never got any sound through the speaker.
  I remind you that the hardware is not involved, as the sound works
  with Windows 10.

best regards,