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no sound on Lenovo Ideapad 110

On my Lenovo Ideapad 110 laptop, with Debian Stretch, I have
sound neither with speaker nor headphone.
Here are some details:
- with WIndows 10, no problem, which means that the hardware is OK.
- with the Debian 9.1 kde live dvd, the sound works with the headphone,
  but not with the speaker.
- with the installed Debian 9.1 kde, no sound at all, with any program
  (including speaker-test)

I must add that pulseaudio runs correctly with the live dvd, but fails
on the installed system, although I copied the /etc/pulse content from
the dvd live.

   E: [pulseaudio] module.c: Failed to load module "module-alsa-sink" (argument: "device=default"): initialization failed.
   E: [pulseaudio] main.c: Module load failed.
   E: [pulseaudio] main.c: Failed to initialize daemon.

Googling gave me nothing useful. Has anybody an idea?

I find it abnormal that such a fundamental thing as sound is so
difficult to configure under Linux. It's that kind of problems which
makes difficult to convince people to abandon Windows for Linux.

best regards,
Pierre Frenkiel