The fn key locked would be released instantly.
Hit FN, F12 and Number Lock key at the same time. If you hit the letter key on the keyboard, but the system show number, that 's because fn key locked, try the solutions bellow to unlock function key. To unlock function key, just set the Action Keys Mode option to Enabled in the bios. Select Disabled, press f10 key to save the selection and reboot. Enter the Action Keys Mode option, and then press the enter key to display the Enable / Disable menu. Use the arrow keys to navigate to the System Configuration option. Press the F10 key to enter the BIOS setup window. Take the HP and Compaq notebook for example: You need to change the setting in the bios to make the function key locked. Instructions to Lock function key(Fn key) That would cause we could not use the default function of F1 through F12 key. 
If you see that there is no problem with the settings of your system, then the next. According to us, this is the first thing you should check if you. However, sometimes you may find system only require hitting the single F1~F12 key without Fn key. The Solutions: Change the Keyboard Settings from your System. The Fn key + F1~F12 key combination provide addition functions for users, such as: increasing or decreasing the brightness of the display, the sound volume, sleep, wireless, lock keyboard, etc. How to unlock and lock function key on laptop
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