08-03-2016 12:36 AM
My T420 have latest BIOS, latest Windows 10 updates and drivers, Ubuntu 16.04 LTS kernel and updates. Randomly my sound output is disappeared :
Please help me, thanks in advance.
04-16-2017 09:31 AM
I have the exact same problem with my T420, dual booting Windows and GNU/Linux..
Have you ever found a fix to this?
If so, it would be great if you shared your solution.
Thanks in advance.
04-16-2017 11:11 AM
It is impossible to diagnose from far away, but I have seen a couple of machines in that series (420, 520) have sound chips (on the motherboard) die.
04-16-2017 12:25 PM
I don't have a solution. You can try this: unplug your laptop from power adapter, unmount battery, press and hold on/off button for 5-10 sec. It works for me two or more months. I don't sure, but this problem may be caused by static electricity - there is no electrical grounding in my power socket.
09-03-2017 03:40 AM
You can try this: unplug your laptop from power adapter, unmount battery, press and hold on/off button for 5-10 sec. It works for me two or more months.
Genius! That brought my audio device back from the dead. When you say for two or more months, do you mean it will eventually fail completely?