is this 6720s laptop ?
all hp laptop with ad1981 use model=hp by default
http://git.kernel.org/?p=linux/kernel/git/tiwai/sound.git;a=commitdiff;h=8970ccda1ae3c3b4ddd5ce366ca2cd88356d664e;hp=a182ee9876c7826d0b8f7789cb5c38c5bfbec441
you may need to confirm
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/869172
and send email to the author of the above patch
is this 6720s laptop ?
all hp laptop with ad1981 use model=hp by default
http:// git.kernel. org/?p= linux/kernel/ git/tiwai/ sound.git; a=commitdiff; h=8970ccda1ae3c 3b4ddd5ce366ca2 cd88356d664e; hp=a182ee9876c7 826d0b8f7789cb5 c38c5bfbec441
you may need to confirm
https:/ /bugs.launchpad .net/ubuntu/ +source/ alsa-driver/ +bug/869172
and send email to the author of the above patch