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[Mauro <1313196@xxxxxxxxxxxxxxxxxx>]

I see, thanks Steffen for your explanation.

I did some better tests. With acpi_osi='!Windows 2012' and the default
3.11.0-12-generic kernel, when I deactivate wifi using the switch button
I get the following output:

0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
1: hp-wifi: Wireless LAN
        Soft blocked: no
        Hard blocked: yes
2: hp-bluetooth: Bluetooth
        Soft blocked: no
        Hard blocked: yes

That is: the phy0 entry is not blocked (sorry for the wrong information
i gave previously), but the hp-bluetooh entry appears as hard blocked,
while the hci0 has gone completely.

This said, I tested the following mainline kernel versions (without using acpi_osi='!Windows 2012') as suggested by Christopher. I did these tests directly on my Linux Mint 16 KDE installation, because installing a mainline kernel version on the live USB stick of Ubuntu 14.04 did not work. Here are the results:
- with 3.12-rc7-saucy (the latest one built specifically for Saucy, which Mint 16 is based on) the problem is still present (the wireless witch button does not work)
- with 3.15-rc2-trusty (the latest one built specifically for Trusty) the problem is fixed (the wireless switch button does work)

However, with 3.15-rc2 without the acpi_osi='!Windows 2012' boot parameter, the output of "rfkill list" is:
0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
1: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no
and when the wifi is disabled it is:
0: phy0: Wireless LAN
        Soft blocked: yes
        Hard blocked: no
1: hci0: Bluetooth
        Soft blocked: yes
        Hard blocked: no

That is: the hp-wifi and hp-bluetooth entries are missing and the switch
causes a soft-block rather than a hard block. I would say the most
correct behaviour is the one I have with acpi_osi='!Windows 2012' (i.e.:
the system sees the hp-* entries and the button performs a hard block),
but I'm not an expert. After all, the final result from a user point of
view is the same (the button works and the led on it reflects the
current enabling state of the wifi card).

I still don't know what acpi_osi='!Windows 2012' is really meant to be
and whether there may be any other side effects when using it.

** Tags added: kernel-bug-exists-upstream-3.12-rc7 kernel-fixed-upstream
kernel-fixed-upstream-3.15-rc2

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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

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

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  This system has a button to enable and disable the WLAN interface. This button has a LED on it: it's white when the WLAN is enabled, orange when it is not. Pressing this button, however, does not have any effect on both Ubuntu 13.10 and Mint 16 KDE (which is also based on Ubuntu 13.10). When I press this button, the following output is produced in dmesg:
  [ 1536.228861] atkbd serio0: Unknown key pressed (translated set 2, code 0xf8 on isa0060/serio0).
  [ 1536.228872] atkbd serio0: Use 'setkeycodes e078 <keycode>' to make it known.
  [ 1536.308669] atkbd serio0: Unknown key released (translated set 2, code 0xf8 on isa0060/serio0).
  [ 1536.308680] atkbd serio0: Use 'setkeycodes e078 <keycode>' to make it known.

  There's just a minor difference in behavior between Ubuntu and Mint:
  while in Mint the led correctly turns white when the WLAN interface is
  enabled (and the outcome of "rfkill block/unblock" is correctly
  reflected by the button led color), in Ubuntu this led seems to always
  stay orange, even if the WLAN interface is active (and connection is
  correctly established). Please note that I only tried to run Ubuntu
  from a USB stick (no installation at all, no update performed).

  WORKAROUND: I can use rfkill block/unblock to enable/disable the WLAN
  interface.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-12-generic 3.11.0-12.19
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ubuntu     2907 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     2907 F.... pulseaudio
  CasperVersion: 1.336ubuntu1
  Date: Sat Apr 26 20:39:42 2014
  LiveMediaBuild: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Hewlett-Packard HP ProBook 450 G1
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/username.seed boot=casper quiet splash --
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/13/2014
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L74 Ver. 01.08
  dmi.board.name: 1942
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 89.10
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrL74Ver.01.08:bd02/13/2014:svnHewlett-Packard:pnHPProBook450G1:pvrA3009DD10303:rvnHewlett-Packard:rn1942:rvrKBCVersion89.10:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ProBook 450 G1
  dmi.product.version: A3009DD10303
  dmi.sys.vendor: Hewlett-Packard

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