Laptop brightness adjustment not working AMD graphics card

drivers graphics-card amd-radeon display-driver amd-graphics-card

14,746

This issue affects lots of AMD cards and drivers. The fix is as follows.

Go to the registry editor (start > regedit)
Change both of the following registries to 0

KMD_EnableBrightnessInterface2

MD_EnableBrightnesslf2

The registry path can vary slightly, but it will be one of the following or something similar. To find they key, I did a search through the registry.

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class{4d36e968-e325-11ce-bfc1-08002be10318}\0000

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{4d36e968-e325-11ce-bfc1-08002be10318}\0001

Reboot.
If it still doesn’t work, in Device Manager, disable your video adapter and re-enable. Make sure your PnP monitor is still enabled.

Note: In my case MD_EnableBrightnesslf2 didn’t exist. In this case just changing KMD_EnableBrightnessInterface2 to 0 will fix the problem.

14,746

SpeedyAkron

I work as a PLI and mainframe developer at a large insurance company. In my free time I tinker with web sites, code programs, play computer games, and volunteer.

Updated on September 18, 2022

Comments

SpeedyAkron over 1 year

I have a Dell Precision M6600 laptop with an AMD Radeon HD 8950 graphic card running Windows 10. When I use the graphics driver from AMD, computer games work great, but the brightness control does not work on the computer. When I switch to the Microsoft Basic Display Adapter(see screenshot) computer games are unplayable, but the screen brightness adjusts correctly. I am forced to switch between the drivers depending on what I’m doing.

I’m running Radeon Software Crimson Edition version 16.7.3 and I’ve re-downloaded the driver a couple of times to make sure it’s the latest. If I go to Device manager, Generic PnP Monitor is always enabled.

It’s a pain having to switch drivers every few days. How do I get the brightness to adjust correctly with the AMD driver?
Donald Duck almost 6 years

DON'T SHOUT! All-caps posts are considered rude and may be quickly deleted.
ecth over 5 years

WHOAH. I have an MSI GX60 (1AE, A10-5750m and 7970m) and I always had a working graphics driver OR adjustable brightness. With linux the fix in grub was easy. But with this solution it works again. THANK YOU :)
Jamesits about 5 years

Works for Lenovo ideapad S405 (I disabled the discrete graphics in the BIOS). Only KMD_EnableBrightnessInterface2 need to be changed to 0.