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A comment on Show HN: Multi-monitor KVM using just a USB switch. Parent comment

Re:Show HN: Multi-monitor KVM using just a USB switch by mjcohen on Sunday February 11, 2024 @03:13PM (#39338215)
I use an app called MonitorControl on a M1 16" MBP running Sonoma that adjusts both the MBP screen and external HP 25f monitor. It adjusts the brightness and contrast of whichever screen the cursor is in.
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Re:Show HN: Multi-monitor KVM using just a USB switch by bmitc on Sunday February 11, 2024 @03:35PM (#39338422)
Right, but that's part of the point. Apple should just have this inside macOS.

From MonitorControl's GitHub README, emphasis mine:

> Most modern LCD displays from all major manufacturers supported implemented DDC/CI protocol via USB-C, DisplayPort, HDMI, DVI or VGA to allow for hardware backlight and volume control.

And a blog entry by the author of Lunar, an app mentioned elsewhere for this problem: https://alinpanaitiu.com/blog/journey-to-ddc-on-m1-macs/

These are not examples of "just works". Apple intentionally does these things to cripple integration into non-Apple products.

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