Enable Dell All-In-One volume up/down keys
Enable volume up and down hotkeys on WMI events
GUID
284A0E6B-380E-472A-921F-
E52786257FB4 and
GUID
02314822-307C-4F66-bf0E-
48AEAEB26CC8.
Also works around a firmware bug where the _WED method
should return an integer containing the key code and in fact
the method returns the key code in element zero of a buffer.
BugLink: http://bugs.launchpad.net/bugs/701530
BugLink: http://bugs.launchpad.net/bugs/676997
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>