There are key presses that can automatically lock the KB in the Filter Key settings. Open Ease of access to check the filters keys. Use an external KB if necessary. Here's an even quicker fix--

https://www.top-password.com/blog/unlock-the-keyboard-on-windows-10-8-7/

You did not change any Dell drivers, I hope. Those are customized for your exact board and almost never get updated by Dell--only Dell can update drivers. Check for your drivers here- https://www.dell.com/support/home/en-us/product-support/product/alienware-m15-r2-laptop/drivers

You must still be under warranty. Contact Dell Support directly for help. We are users helping users here in the forum.  Oops-- just remembered you are out of the country now which will be a problem. Try adding a usb keyboard to test. 

Hope someone else will help. Sorry I'm out of ideas.

Hi Mary,

Thank you for responding. I have tried and tried again the solutions from the page you suggested, but the issue still persists.

Come to think of it, there is no Standard PS/2 keyboard driver since the day the keyboard stopped working.(refer to the image) 

Hi,

No, I did not change any drivers that came with laptop. I don't see any keyboard drivers suggested when I go to check in the dell website. 

I have contacted the Dell support once before and they agreed it must be a software issue since it's working in bios and boot menu. They tried what they could and escalated it to level 3 and came back saying it's a hardware and motherboard issue. But they had no answer when i reiterated that it's working perfectly in diagnostics and during windows updates the bios has clearly mentioned that the keyboard is locked.

And I have been relying on an external USB keyboard ever since the laptop keyboard has stopped working, to get the work done. So, there's no issue there.

Anyway, thanks for responding and trying to help.

Have you tried a clean boot?

if all else fails then you need a new keyboard.

Try this,

Intel HID Event Filter Driver | Driver Details | Dell US

If it works in the BIOS, its not a hardware issue. All people who barely know tech know that. So I don't know why DELL would tell you Hardware.

Also this is meant to fix any issues with all input devices because the BIOS can properly communicate with the OS.

Yep. If it is unusable. I would do a "Factory-reset" of the boot-drive.
Then, first thing, update the bios, as well Dell's chipset drivers first.
I've done it many times.

hi. just bought this x15 r2 last july 2023 and a week ago keyborad stop functioning.

went to dell support an updated firmware and saw during setup keyboard is locked.

anyone can help or any ideas how to resolved this.

thanks in advance