Brightness Not Working Windows 7
I had my laptop, which is an HP Envy 15 ae116tx model, fixed in a service center because of screen discoloration (it's a touchscreen btw). They replaced the display panel. I got it back after a month and I noticed that the screen brightness control is notworking anymore. The brightness control in the taskbar is greyed out and cannot be adjusted, the function keys in the keyboard are not adjusting the brightness as well, and there's no adjustment slider in the power options.I've searched online and tried any possible solution there is, but unfortunately, none of them worked for me. I'm very frustrated now and I don't know what to do. The following are the solutions I tried:DEVICE MANAGER SOLUTIONS1.) Updated the display driver as suggested, it did not work.2.) Disabled and enabled the display driver, it did not work.3.) Uninstalled the display driver and reinstalled it, rebooted my laptop, still it didn't work.4.) Disabled and enabled the Generic PnP Monitor, it didn't work (it was enabled in the first place btw).5.) Uninstalled and reinstalled the Generic PnP Monitor driver, still didn't work.
At times, especially after upgrading to Windows 10 or after performing a clean install of Windows 10, you might notice that the brightness controls on the keyboard or brightness settings in Control Panel are not working. If display brightness settings are not working, it’s likely because of faulty or outdated graphics driver.
Brightness Not Working Windows 7
I also clicked 'show hidden devices' and uninstalled all the drivers under Monitor, including the hidden ones, reinstalled them and still didn't work.6.) I rolled back to the old versions of my display drivers, still didn't work.7.) I switched to Microsoft Basic Display Adapter, brightness still cannot be adjusted.OTHER SOLUTIONS1.) I updated my Windows, installed the anniversary update. I installed and updated all suggested updates in the Windows Update tab, but it didn't fix the brightness control problem.2.) I did the regedit solution, there's no KMDEnableBrightnessInterface2, so I made one up and restarted my laptop, still didn't work.3.) I can't remember where I found this solution, but I did something about changing a value for a key/sub-key in regedit.I did more solutions as I can remember, but none of them really worked. I considered refreshing my operating system in hopes of making the screen brightness adjustment work, but I want to know if thereare more other options. Since I had the display panel replaced for my laptop, I don't know if it has something to do with that.Also, I can only adjust the brightness manually with the Intel HD Graphics Control Panel but of course, I don't want to resort to that since I still don't get the default screen brightness control. Ifnothing really works, I might have to contact the service center again to ask for a solution.I hope someone can help me.
Brightness Control Not Working Windows 7
I'm really exhausted looking for other options. This thread is remarkable to me because I am having the exact same issues and thought I was the only one. I, too, have an HP Envy, had it repaired for screen discolorations, got it back, and have been having intermittent issues with my brightness settingsbeing disabled (clicking the battery button shows a grayed out brightness button). My HDMI port has also been tricky whenever I try plugging it into projectors.Like the person above, I do not have MDEnableBrightnesslf2or KMDEnableBrightnessInterface2 anywhere in my registry (according to Ctrl+F in regedit).Please help.-Max.