🌟 Update: Multi-monitor support for brightness adjustment!
With version 1.31 of Brightness.Manager.OK it is now possible to adjust the brightness via the gamma ramp on all active monitors individually or simultaneously!
* 🔄 Multi-monitor capability : Brightness is no longer only changed on the primary display.
* 🖥️ All active physical monitors are now detected and addressed directly via their respective device contexts (`HDC`).
* ✔️ Improved compatibility for multi-monitor workstations, e.g., for office setups, CAD, photo editing, or presentations.
2.) Technical background:
The gamma adjustment function has been enhanced to set a separate brightness curve for each connected display device (e.g., `\\.\DISPLAY1`, `\\.\DISPLAY2`, etc.). This checks whether the respective device is active and supports the gamma ramp.
3.) Why is this the case under Windows?
Windows handles brightness on a per-monitor basis. System-level gamma control only works by directly addressing the respective monitor (e.g., `\\.\DISPLAY1`). If only the standard desktop context is used (`GetDC(NULL)`), often only the primary monitor is affected—all others remain unchanged.
4.) Brightness settings and problems under Windows
There are two ways to control brightness in Windows:
1. System brightness (hardware-based) - via monitor hardware or GPU capabilities (e.g. on laptops).
2. Gamma correction (software-based) - often simulated using a gamma ramp, as in Brightness.Manager.OK.
There are a few problems with this:
* 🔒 Driver limitations : Some graphics card drivers block or override gamma changes.
* 💡 HDR monitors : Starting with Windows 11, HDR can disable gamma control or affect it unpredictably.
* 🖥️ DisplayPort monitors : These often react differently than HDMI or integrated displays.
* 🔄 Auto-reset : Windows can reset gamma settings when switching users or entering sleep mode.
5.) Are there differences between Windows 10, 11 and 12?
Yes. While Windows 10 generally reliably applies the gamma ramp to the primary monitor, Windows 11 (and 12) exhibits different behavior on certain displays—particularly with multi-GPU systems, HDR, remote desktops, or virtual monitors. Starting with Windows 12, automatic brightness adjustment (Adaptive Brightness) is also increasingly active, which can override manually set values.
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