Comment # 1 on bug 916608 from Takashi Iwai

The following commits can be backported safely, at least.

For HD-audio:
6d16941aee6eb468c5a5cc78ecbaf840f3e16df5
f31b2ffcad2b8c57cee5ffc634928bcbc8c6a558
d1585c89cecdb513f68045e47ab76976524b5961
c8b00fd2f4c504a564adcad5b8bd6952ab850b02
b4565913460cbd7d86c6bd52913dfaa07fa384aa
b734304f15ebe2a1e89fb9422541fbecf50b7cd9
fedb2245cbb8d823e449ebdd48ba9bb35c071ce0
f62f5eff3d40a56ad1cf0d81a6cac8dd8743e8a1
8b72415d8aa8bb1904c61926bd0701447ce44bee
4344aec84bd84b58a01347f0db7693f73fb6473d
506b62c33a7444b91a93bf2da772f4c7e6656410
c507de88f6a336bd7296c9ec0073b2d4af8b4f5e
60834b73a9c2bbc2f514122ddc626f3350fb40cd

For USB:
6455931186bff407493135e74c5f32efd30860e2
d70a1b9893f820fdbcdffac408c909c50f2e6b43
0725dda207e95ff25f1aa01432250323e0ec49d6
1a290581ded60e87276741f8ca97b161d2b226fc

For misc:
317168d0c766defd14b3d0e9c2c4a9a258b803ee
d1d0b6b668818571122d30d68a0b3f768bd83a52
0767e95bb96d7fdddcd590fb809e6975d93aebc5