Do you need to control the brightness, or just set it to zero?When I connect the PI3 to the monitor and type: export DISPLAY=:0;xrandr --output HDMI-1 --brightness 0, it totally blanks the display, which is exactly what I want.
So how can I get the PI4 to dim the screen like the PI3 does?
Setting the brightness to zero is basically the same as activating the screensaver, except that it will not wake up when you press a key. Also, the screensaver may put the display into power saving mode after a while. Setting brightness to zero will continue to output a video signal, just with all the pixels being black.
Reducing the brightness to a non-zero fraction means you have fewer shades of red, green, and blue available, degrading picture quality. So you would be better to do that using the monitor's own settings.
Statistics: Posted by jojopi — Fri Dec 20, 2024 10:50 pm