Solve the problem that the PS/2 interface keyboard cannot be used
After the newly purchased PS/2 interface keyboard is connected to the computer (Win11), the light does not light up, and the keys do not respond at all.
The repair method is:
enter and execute the following command in the command prompt window:
reg add HKLM\SYSTEM\CurrentControlSet\Control\Class\{
4D36E96B-E325-11CE-BFC1-08002BE10318} /v UpperFilters /t reg_multi_sz /d kbdclass /f
After restarting the computer, it can be used normally.