Petar Šegina

An alternative to ZeroSSL is also the Namecheap PositiveSSL certificate - https://www.namecheap.com/security/ssl-certificates/comodo/positivessl/. Tried it out and it works.

To confirm this - the mic mute button on my X220 works, but it doesn't work on the USB Compact Keyboard.

Using showkey, my internal mute button gives a scancode 0x5a 0xda and a keycode 190. The external keyboard gives a keycode 248, but no scancode, while all the other keys...