1.1. Set system variable
devmgr_show_nonpresent_devices=1
1.2. Logoff and logon
1.3. Open Device Manager (Control Panel > System > Hardware > Device Manager)
1.4. From the View menu click Show Hidden Devices and notice the change
Method #2
2.1. In registry key
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment
2.2. Create the following value (DWORD): devmgr_show_nonpresent_devices and give it a value of 1.
2.3. Reboot
2.4. Goto 1.3
Thanks to Daniel Petri
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