Hello Pavan,

Could you try the following - edit /etc/modprobe.d/alsa-base.conf and
add the following line:

options snd-hda-intel model=auto

Save the file and reboot your computer. Please report back if all inputs
and outputs are now working correctly. Thanks!

** Changed in: alsa-driver (Ubuntu)
       Status: New => Incomplete

** Summary changed:

- PCI/internal sound card not detected
+ [Toshiba C640] Internal mic not working

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https://bugs.launchpad.net/bugs/1043264

Title:
  [Toshiba C640] Internal mic not working

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