Question PS/2 mouse and keyboard suddenly stooped for good working in Win 10

[nelugalbenush]

Hello!

Recently, after years of using windows 10 and one PS/2 mouse and one PS/2 keyboard without any problems, they (the mouse and the keyboard) suddenly, one morning, stopped working under win 10. The odd part is that in BIOS they both still work. I am puzzled because I know that PS/2 port doesn't require software to operate, it is pure hardware. I never encountered that in 25 years since I operate a PC.

What I remember in that particular day, first I had a crash in Windows, I had five or six windows opened and I was working simultaneously in them. I also remember that I rebooted from the switch and the system took me directly to BIOS and I didn't realize then what is really happening, not understanding why I am there in BIOS. Then, after a few bootings I realized what is happening, seeing that my PS/2 keyboard and mouse work in BIOS but they won't in Windows 10. Of course I had to use a USB mouse and keyboard to solve this issue. My hardware is not old. The motherboard has 3-4 years and , YES, it has PS/2 ports , too, in case you are wondering.
Any idea why is that and how can I solve this issue to go back to my "old" PS/2 keyboard and mouse ?

My rig: CPU i7-8700 3.20Ghz/16GB RAM/Windows 10 Pro 22H2 version/ OS build 19045.3448/Gigabyte RTX 3080 Ti 12 GB VRAM

 

[Fix_that_Glitch]

It actually does need drivers while in use under Windows. It is located in C:\Windows\System32\drivers folder. Specifically, i8042prt. sys

 

[LinuxDevice]

Incidentally, those keyboards go through a serial UART (this is the driver mentioned by @Fix_that_Glitch ). Half of this is that the serial UART does need a driver (though it is an incredibly common and simple driver). On many PCs the BIOS itself also has an option to enable or disable serial UARTs (it might be listed as a UART, or it might be listed as the PS/2). It is possible your BIOS lost the UART enable. If that's the case, then perhaps the battery is low, but enabling this again would do the job if that is what causes the problem. You could always test a bit more by booting up a live Linux DVD distribution (which does not require install; works from a thumb drive or a DVD).

 

[nelugalbenush]

Well it might worth a shot the thing with the battery but I doubt it is that, because motherboard has 4 years max. I had batteries that still work with old systems (3Dfx Voodoo graphics board) I use today for some old games.
I'll go see if the BIOS had an UART switch.

 

[nelugalbenush]

It actually does need drivers while in use under Windows. It is located in C:\Windows\System32\drivers folder. Specifically, i8042prt. sys

Nope, I tried that and then I realized that doesn't solve it because PS/2 port uses hardware only, it has NOTHING to do with port controller software.

 

[nelugalbenush]

I found, looking closely a super I/O configuration, I've read that THIS one is responsible for PS/2 keyboard and mouse. It was ENABLE, I switched it off and then on, but still doesn't work in Windows.
I looked there is no UART section in BIOS, so I am out of ideas.