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, an AMD FirePro M6000 video card)
#2 Right click on the display adapter and choose ‘Disable’
This will temporarily disable the display adapter. The screen resolution will change to a very low resolution but do not worry about that.
#3 Now, re-enable your display adapter:
Right click on the display adapter again but this time choose ‘Enable’ to re-enable your display adapter.
#4 Voila, you should now have working brightness adjustment again!