Lenovo R400 (X200) Sound weirdness
After having (really frustrating) problems with getting sound out of my internal speakers after the first time I used headphones, I found that nothing in forums worked out for me. I tried setting module parameters, different kernel-versions, different Alsa versions but nothing helped… at all.
The other day I forgot to plug in the charger and the battery dried out. At first the laptop would not start… then after some hours of charging it suddenly came to life and started making weird beeps. I got a message that the BIOS settings had been reset. After i modified all settings to my liking, i booted up; and what do you know – the sound was back! It even works when i plug in and out the headphones.