This method is tested on a Ryzen 7 4750U embedded graphics card, driver version 20.10.41.02-200916a-359311C-HP. Vari-Bright will adjust the gamma (!) according to your environment brightness which makes color on your display way less accurate (looks like color is washed out) and it is super-sensitive (triggers on average room lighting). AMD Vari-Bright is not the same as the brightness auto-adjustment that comes with Windows.The values are: Maximum battery life: hex:04,00,00,00 There is another key abmlevel at the same level for controlling "Vari-Bright Level". To disable it: abmuserenable to hex:01 to enable it. Maybe I'm a little late, but for newer AMD drivers, there's a different registry key controlling Vari-Bright. inf files have the string :HKR, PP_VariBrightFeatureEnable which looks like the key goes somewhere under HKEY_CLASSES_ROOT (I'm assuming they're using an unconventional abbreviation of this one), but I'm not sure where exactly or even whether this interpretation is correct. I don't know where it's supposed to be so I'm unable to add it manually either.ĭoes anyone know the correct way to do this? The setup's. Huge thanks to harrymc for the correct download location on the Sony website, which I had failed to. This makes a tremendous difference to the usability of this machine on Windows 7. However, I've searched the registry all over (even with some regex-fu on Regalyzer ), but haven't been able to find such a key. After this, the Fn key worked fine - Ive tested it with F2 (mute), F3 & F4 (volume), F5 & F6 (brightness) and F12 (hibernate). So, I'm trying to find a way to do this directly, by whatever means CCC internally does it.Īfter some ack-ing and some googling, it looked like all I needed was to set a registry key PP_VariBrightFeatureEnable to 0. It's a memory and CPU hog, and tends to leave corrupt installations which make deinstallation or upgrading a pain. The difference is, I do not have Catalyst Control Center installed and wish to avoid it as much as possible. I have a very similar configuration, ATI mobility Radeon HD 3670 on Dell XPS Studio 16 using Windows 7 64-bit, and have the same problem of atibtmon.exe throwing an error every time power is removed. Related to: When AC Power is disconnected, atibtmon.exe throws a Runtime error
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