I have Lenovo Y550 laptop but as I know this issue releated to all Lenovo Yxx0 laptops.
My "disable sound" hardware button have a led-indicator. This idicator work in Windows, but always not light in Kubunt (I not tried it, but probably in Ubuntu too).
Photo of this indictor and hardware information attached.
Binary package hint: kubuntu-desktop
I have Lenovo Y550 laptop but as I know this issue releated to all Lenovo Yxx0 laptops.
My "disable sound" hardware button have a led-indicator. This idicator work in Windows, but always not light in Kubunt (I not tried it, but probably in Ubuntu too).
Photo of this indictor and hardware information attached.