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HP G1 with Switchable graphics: Cannot control Vari-Bright or Variable
This is windows 10 Pro running on HP 450 G1 with Switchable Intel HD & AMD Radeon HD 8600/8700 Graphics.
I actually have 2 of these, identical except for one having SSD the other HDD.
Both are up to date Windows 10 Pro Version 19043.1052
The Graphics drivers appear to be last/current on both.
The issue is old Vari-bright [sometimes written vari-brite] - an AMD power saving feature similar to Windows [or is it Intel?] Variable Brightness, although the purpose for each is different as I read: The AMD 'feature' responds to what is being displayed; the Windows feature responds to ambient lighting.
The problem manifestation looks like a monitor problem: the display brightness nervously changing three or four times in a matter of seconds as one engages with applications painting the screen. I've dealt with this in the past, usually easily resolved with the AMD control panel, old or new. In this case, neither old Catalyst or new "Radeon Software" panels have a setting for the feature - it is being defeated somehow. I've looked up the data and pictures etc on both - its just not there. Using Catalyst, the entire PowerPLay section is actually empty. The category is there, but there is nothing 'under' it.
How do I defeat this devil? I searched the registry for a "Vari-bright" key but there is none.
all help gladly applauded!