I just learned that there are programs to control the brightness of external monitors just like you can adjust your laptop’s integrated display. On windows, the most well known one is monitorian (FOSS), on linux you can (on Gnome) even use shell-extensions to have a brightness slider just like you do for the integrated display.
I might be out of touch, but is this well known?
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.