I was able to fix this via:
ben@padfoot:~$ cat /etc/modprobe.d/alsa-base-local.conf
options snd-hda-intel model=generic
So I suspect that the issue is that the incorrect sound module is being
initialized:
12: PCI 1b.0: 0403 Audio device
[Created at pci.318]
Unique ID: u1Nb.2XHpwI6nOAD
SysFS ID: /devices/pci0000:00/0000:00:1b.0
SysFS BusID: 0000:00:1b.0
Hardware Class: sound
Model: "Intel Audio device"
Vendor: pci 0x8086 "Intel Corporation"
Device: pci 0x1c20
SubVendor: pci 0x17aa "Lenovo"
SubDevice: pci 0x21cf
Revision: 0x04
Driver: "snd_hda_intel"
Driver Modules: "snd_hda_intel"
Memory Range: 0xd4320000-0xd4323fff (rw,non-prefetchable)
IRQ: 53 (209 events)
Module Alias: "pci:v00008086d00001C20sv000017AAsd000021CFbc04sc03i00"
Driver Info #0:
Driver Status: snd_hda_intel is active
Driver Activation Cmd: "modprobe snd_hda_intel"
Config Status: cfg=new, avail=yes, need=no, active=unknown
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https://bugs.launchpad.net/bugs/1095863
Title:
after update, headphone jack on W520 stopped working
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