Thinkpad T450: can't change display backlight

Tue Jul 5 14:38:39 UTC 2016

> Hi,
>    
> I just bought a Lenovo Thinkpad T450 laptop and installed FreeBSD on top of it.
> It runs fine except I'm not able to change the display backlight. The laptop embeds
> a Core i5-5300U CPU with an Intel Graphics 5500 adapter (Broadwell). I know the adapter
> is not yet supported, but I hoped to have backlight control working anyway!

The FreeBSD Desktop project has made substantial progress in Broadwell 
support. You should start here:
https://github.com/FreeBSDDesktop/freebsd-base-graphics/wiki

Good luck!
Juan