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Command line override for FN + F5 wifi and bluetooth switch

Question

In a school environment, the students have discovered they can cause trouble by using the Fn+F5 software switch to disable the Wifi radio. I know the hardware LED goes off when this happens, but the teachers are too busy to identify this. The result is that users cannot login, and the Windows Welcome screen is not intuitive enough giving an error message "There are currently no logon servers available".

 

I'm interested in applying a "fix" for this issue on startup. Possibly a Windows Registry fix, to "force" the Lenovo software switch to turn Wifi on.

 

I've had a poke around with a registry comparison between off and on states, and am currently getting the following diff (amongst other changes, such as DHCP etc):

 

HKLM\SYSTEM\ControlSet001\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}\0018\RadioEnable: 0x00000000
HKLM\SYSTEM\ControlSet001\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}\0018\RadioEnable: 0x00000001
HKLM\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}\0018\RadioEnable: 0x00000000
HKLM\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}\0018\RadioEnable: 0x00000001

 

However, forcing these dwords to 0x1 does not seem to be enough to switch the radio on.

 

Has anyone else had a similar experience? Is there some underlying BIOS/UEFI setting that might be able to be accessed via software?

Answer

Control of the wireless radio switch can be attained via the command line:

 

"C:\Program Files\Lenovo\HOTKEY\TpFnF5.exe" /wlon

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