I have an aging Dell XPS 13 Ultrabook (L322X) that’s had a pretty good life so far, bar the continual gripe regarding the Track pad (kind of a known issue due to the Cypress drivers) its been a great little laptop.
I upgraded to Windows 10 a while ago and everything works pretty well, it looks like even the Track pad issues are resolved. The one thing I noticed yesterday though was that the Function (Fn) keys no longer worked for the screen brightness. They still worked fine for Audio control and flicking Wireless on/off but absolutely zip in regards to screen controls.
I ran all the updates I could (not that there’s many!) with no joy, the actual fix was really simple. Turns out the Monitor driver just needed removing / re-adding as below –
- Open Device Manager
- Under Monitors if you don’t see ‘Generic PnP Monitor’ it’s likely this that’s broken the Fn Keys. In my case I had ‘PnP Monitor (Standard)’ listed.
- Right Click the Monitor device that’s shown and click ‘Uninstall’
- Once removed click Action from the above menus and click ‘Scan for hardware changes‘
- Check under Monitor again and you should now see ‘Generic PnP Monitor’ – the brightness Fn controls will hopefully be working again!