ThinkPad: S Series, ThinkPad Yoga and Twist Laptops.

ThinkPad: X Series Tablet and Helix Laptops.

ThinkPad: P and W Series Mobile Workstations.

ThinkPad: T400 / T500 and newer T series Laptops.

Recently Released Critical Drivers - Read Only.

Recently Released Service Tips - Read Only.

**Note: When performing these updates, please make sure your AC adapter is connected and that you have at least 30% of battery charge on your device. Then head to Drivers & Software then BIOS for the Bios update and Chipset for the other three drivers. Just plot in the serial number for your device and hit enter, might have to hit it twice. I'd suggest trying to download and install the newest BIOS / Chipset / Serial I.O and Management Engine Interface drivers from the Lenovo Support Page. Select the latest keyboard related driver from the list and click 'Next' Select 'Let me pick from a list of available drivers on my computer' Select 'Browse for drivers on your computer' Right click the keyboard device and select update driver. In the event this does not bring it back, go to the device manager again, Perform a restart of the computer to have Windows install the most generic drivers for this device.

If prompted to uninstall drivers associated with the device, tick the box and continue. Under 'Keyboards' - Select the device in question, right click and select 'Uninstall Device' There might be more then one device listed. Press the Windows key+X, select 'Device Manager'

On your keyboard, locate and press the ALT + ctrl + fn keys.

Restart your computer and check if the issue is resolved.

Run the Hardware and devices troubleshooter.

Click on troubleshooting and click on the view all option on the left panel.

Change the view by option on the top right to Large icons.

Press Windows key + X, select Control panel.

Here's a few troubleshooting steps you can try to remedy the issue:

Left ctrl key not working windows 10