Thanks!
That thread seems helpful. I did exactly what it said and add the option line with the model=thinkpad, as in AD1984 header, reboot the computer, but still nothing happened.

so I should remove those lines myself?
well I tried that, but nothing happened

alsaconf can recognize the sound card as hda-intel, but I can't hear anything.
I saw a similar post posted last year. Has the problem fixed?