Comment 3 for bug 1078924

if your E6520 use those headset/microphone combo jack , you need to send email to the author to add pci quirk for E6520

00:1b.0 0403: 8086:1c20 (rev 04)
 Subsystem: 1028:0494

http://git.kernel.org/?p=linux/kernel/git/tiwai/sound.git;a=commitdiff;h=8d032a8f653a71e309fc4be28f526a0d2a5bf8f4;hp=5c2e4e0ab6f3faa5b68ffa68a01b050acccf04ac