Windows 10 F11 and F12 buttons no longer adjust display brightness !!??

[Mike Goodger]

Windows 10 Home, Lenovo Ideapad 510S.
The buttons simply no longer adjust brightness - brightness is at max all the time.
I love computers.
Can anyone help please?
Mike

 

[nmsuk]

Try installing the latest lenovo software, it should fix that

 

[Mike Goodger]

Installed System Update as suggested, and F11 and F12 work again now.

Many thanks!
Mike