Fix the brightness adjustment buttons on a Dell M6700 [SOLVED]
Occasionally after a few hibernate/resume cycles, my Dell Precision M6700 laptop’s brightness UP/DOWN buttons become unresponsive (specifically, the Fn+Up Arrow and Fn+Down Arrow key combination). Rebooting will fix the issue but sometimes if you are in the middle of something that can be a major inconvenience. Thankfully the same solution I posted for other Dell models also works on the M6700 🙂 Instructions for re-enabling brightness adjustment (without rebooting) #1 Go into device manager and locate your display adapter (in my case,