no sound in internal speaker but headphone works

Hi,
I installed LUBUNTU20.04 on my Lenovo3000 Y410 laptop. I installed all required drivers, now everything is working fine but no sound from internal speakers. Headphone is working fine. I check alsamixer, speakers sound null there then I set it to 100 but got no sound . On reboot again speakers sound setting becomes null. In windows 10 speakers working fine.
pulseaudio, pavucontrol-q are installed and working. I did the following:-
laxman@laxman-lenovo3000y410:~$ sudo apt-get install --reinstall alsa-base alsa-utils
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
  apmd alsa-oss oss-compat
The following NEW packages will be installed:
  alsa-base
0 upgraded, 1 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 0 B/1,167 kB of archives.
After this operation, 475 kB of additional disk space will be used.
Selecting previously unselected package alsa-base.
(Reading database ... 309780 files and directories currently installed.)
Preparing to unpack .../alsa-base_1.0.25+dfsg-0ubuntu5_all.deb ...
Unpacking alsa-base (1.0.25+dfsg-0ubuntu5) ...
Preparing to unpack .../alsa-utils_1.2.2-1ubuntu1_amd64.deb ...
Unpacking alsa-utils (1.2.2-1ubuntu1) over (1.2.2-1ubuntu1) ...
Setting up alsa-base (1.0.25+dfsg-0ubuntu5) ...
Setting up alsa-utils (1.2.2-1ubuntu1) ...
alsa-state.service is a disabled or a static unit not running, not starting it.
Processing triggers for man-db (2.9.1-1) ...
Processing triggers for systemd (245.4-4ubuntu3) ...
laxman@laxman-lenovo3000y410:~$
I did a lot of that I could but failed to get voice from speakers.
please help me.
Thanks.