@Tim,

The patch may no longer valid as HP changes some of their BIOS
behaviours for wireless hotkey. Do you have any problems other than
wireless hotkey?

After kernel 3.6, Linux kernel returns true for _OSI("Windows 2012"),
and wireless hotkey triggers different event (not WMI). A different
kernel (hp-wireless) is needed but it is not available until kernel
3.14.

Do you want to try mainline kernel later than 3.14 @
http://kernel.ubuntu.com/~kernel-ppa/mainline/?

If it doesn't work, will you please upload acpidump (sudo acpidump >
acpi.log) for my references?

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https://bugs.launchpad.net/bugs/1118689

Title:
  HP envy dv4 - radio kill hotkey does not work

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