I installed Mint 15 on my Macbook Air 1,1 and there's no sound from built-in speaker. Although there are many similar topics discussed on Internet but none of the solutions work for me. Here is the info collected by alsa-info.sh


While searching the solutions, I found Realtek provides their ALSA driver which seems newer than the version I installed. It's a pity that the result is worse. I got no sound either from built-in speaker or headphone. This is the info with Realtek's driver


I'm interested to know what the difference is between these two logs and how I can fix my problem on built-in speaker.