After updating my Debian jessie laptop yesterday, the mute/unmute button stopped working. The volume up/down buttons work and I can mute the sound but when I press the mute button again to un-mute, the 'PCM' control in 'Playback' stays disabled and also the 'Speaker' checkbox under 'Switches' become un-checked.Here's a quick demo of the faulty behaviour: https://vid.me/LFRi (at around 00:07 mark I press the mute button and then quickly press it again to un-mute yet the PCM and Speaker controls do not change in Alsa Mixer)Not sure how to go about fixing this, any suggestions?Thanks.
Alsa mixer unmute problem on Thinkpad laptop
debian;audio;alsa;desktop