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Similar tool for macOS that also controls built-in displays and Apple monitors: https://github.com/MonitorControl/MonitorControl

Not aware of a similarly polished GUI tool on linux, but I use this: https://github.com/rockowitz/ddcutil

It's been super convenient having found all these tools (I use all 3!) for software control of monitors recently.

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On Linux there are ddcui and gddccontrol (from ddccontrol), although they probably aren't as polished as the options for Windows/macOS. There is also the non-mainline ddcci driver, which lets Linux systems manage external monitor brightness just like it would internal screens on laptops.

https://github.com/rockowitz/ddcui https://github.com/ddccontrol/ddccontrol https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux

MonitorControl is the most native Big Sur UI I've seen from an open source project. Nice.

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