Been working on getting my E6400 up and running over the last few days on OSX 10.7.5 and have just about everything working right thanks Mariusz and his great post.
Here's the two issues I'm coming up with right now:
Volume control does not actually change the speaker output level. The onscreen indicator shows the level change but the actual playback level doesn't change. Mic line input not working. I can get the digital mic to show signal, but cannot get the mic line input to show any signal no matter what I send to it. I'm guessing it's something with the OSX setup or the audio driver because I know the jack itself is good because I was just recording through it last week with Windows 7 on this laptop.
Any help would be much appreciated.