Hi Rajibul,
Thanks for your post. Generally speaking, the device manager might take effect. If you want to disable your laptop keyboard permanently, you can also try to use the Command Prompt. We'll use the sc command-line utility to configure the service and set its start parameter to disabled.
To disable the laptop keyboard permanently:
Press the Win key and type cmd in the Windows search bar.
Right-click on Command Prompt and select Run as Administrator. Click Yes when the UAC prompt appears.
In the Command Prompt window, type the following command and press Enter. For example,
sc config i8042prt start= disabled
When the success message appears, close the Command Prompt, and restart your PC. After the restart, your laptop keyboard will stop registering any inputs.
Note that, for this to work, you will need to uninstall your keyboard from Device Manager as shown above and restart your PC.
If you change your mind and want to re-enable the keyboard, you can use the following command in an elevated Command Prompt. For example,
sc config i8042prt start= auto
Once you see the success message, restart your PC to apply the changes.
If the Answer is helpful, please click "Accept Answer" and upvote it.