Today I tried 
http://cdimage.ubuntu.com/daily-live/current/vivid-desktop-amd64.iso.
A regression with the wireless switch state is there too.
With that image, the wireless switch is always white, disregarding the wireless 
card activation state (enabled or disabled).
Toggling works, however (it always produces a soft block).

In summary:
- with 13.10 and kernel version 3.11.0-24.41 the button works perfectly 
(toggling works, white led colour for enabled, orange for disabled), apart from 
the fact that it causes a soft block rather than a hard block (but maybe this 
is the desired behaviour)
- with 14.04 and kernel version 3.13.0-36.63 wifi toggling works, but most of 
the times the led says orange even when wifi is enabled (it doesn't happen 
always, but often... I still haven't understood when it happens, it seems 
randomly)
- with 15.04 from the daily live wifi toggling works, but the led stays always 
white, even when the wifi is disabled

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https://bugs.launchpad.net/bugs/1313196

Title:
  [HP ProBook 450 G1 Notebook PC] Wireless switch not working

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