I'd like to use xrandr to change the colour of the display and the brightness below what the screen offers, for example:
$ xrandr --output HDMI-1 --brightness 0.7
$ xrandr --output HDMI-1 --gamma 2:2:2
but these commands do nothing and give no error. The redshift tool (package redshift on debian) also uses methods to get a more red and less bright display, same result.
I am wondering if it's just that they are not implemented in the driver? Is it planned? Thanks
System
Raspberry Pi 4 with raspbian, experimental driver enabled (dtoverlay=vc4-fkms-v3d in /boot/config.txt). I also tested without the experimental driver and it's the same result.
# cat /etc/rpi-issue
Raspberry Pi reference 2019-09-26
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 80d486687ea77d31fc3fc13cf3a2f8b464e129be, stage2
# vcgencmd version
Sep 24 2019 17:34:30
Copyright (c) 2012 Broadcom
version cd3add54955f8fa065b414d8fc07c525e7ddffc8 (clean) (release) (start)
# uname -a
Linux raspberrypi 4.19.75-v7l+ #1270 SMP Tue Sep 24 18:51:41 BST 2019 armv7l GNU/Linux
Thovthe, shuddertrix, pjh64, Rijul-A, scowalt and 17 morejpf11 and teekamsuthar
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