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The other incredibly annoying fault with Apple M1 and external displays is that you cannot control the volume of a high resolution display connected via USB-C. eg Philips Brilliance 499P a fantastic Ultra-wide display that I bought because I could not connect my previous 2 monitors.

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Check out monitorcontrol. Think it works over usb-c in your case but not positive. https://github.com/MonitorControl/MonitorControl

Very cool, thanks for suggestion (and for implementing it).

Try “Lunar” it lets you control brightness and volume using the system keys on most but not all monitors: https://lunar.fyi/

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