Yesterday I experimented a really strange behavior in my Thinkpad.
After working with LMMS (a music production program) with my headphones, I turned off my laptop and unplugged them.
The next time I turned it on, I realised there was no sound at all: neither in LMMS, nor in the laptop in general. I was only able to have sound output through my headphones.
ALSA mixer sound levels are at max power, that's all I could test.
Has anybody experienced the same?