It's called the DDC protocol by the way. Like someone else mentioned, Twinkle Tray is a great option for windows, as is ClickMonitorDDC if you don't want to use windows store apps.
this post was submitted on 08 Sep 2023
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I've been using Twinkle Tray for some time and found it pretty useful.
I've burned my eyes for so long while gaming in a dark room, wish I would've found out about this sooner.
Do your guys' monitors not come with buttons for brightness and contrast?
They're typically not a physical toggle though, but a simple board which passes a message to the lcd controller board. You can also send these messages via your display connection.
One of the sticking points for linux wayland nvidia drivers, can't actually dim the monitor down to a sane level for a dark room. Sigh. Marketing drivel about hdr brightness nits but no data on how low can you go...
Samsung is bad too, their display ports dont support ddc, but the HDMI port in my Odyssey is limited to 4k 120Hz.
Wow, good tip!