kern/148741: [sound] Headphones are deaf (do not work) on Lenovo ThinkPad X300

[vermaden]

mav at FreeBSD.org:
> Synopsis: [sound] Headphones are deaf (do not work) on Lenovo ThinkPad X300
> 
> State-Changed-From-To: open->closed
> State-Changed-By: mav
> State-Changed-When: Mon Nov 26 15:09:31 UTC 2012
> State-Changed-Why: 
> Proposed hints looks like overkill, but as far as it works, that is OK.
> 
> http://www.freebsd.org/cgi/query-pr.cgi?pr=148741

Closing this PR is OK under one of these conditions:

 - LINK to that X300 specifical configuration/hack PR should be within FreeBSD Handbook.
 - Information for X300 specific configuration should be directly in the FreeBSD Handbook.

Regards,
vermaden