Lenovo ThinkPad S440

= Hardware Status =

Extra hardware information
lspci -nnk

lsusb

= Configuration details =

Compiler flags
Main article: Safe CFLAGS

Sound
It may be that sound does not work out of the box. This is caused by the order in which the kernel modules are loaded and the fact that there is a HDMI and PCH sound card in the laptop.

First, test if the PCH sound card is functional. Get a list of all PCM devices

Next, test sound output (you should hear noise):

Finally follow the advice given in https://wiki.gentoo.org/wiki/ALSA#HTML5_does_not_play_in_firefox_browser and

Reconfigure and reinstall grub and reboot to make the change effective.