This shell script, fullbright, selects one of your backlight of one of your displays and (if its backlight brightness is not maximized) sets the backlight to the value found in its max_brightness file.
At the time of writing, this script will only attempt to maximize the brightness of the first backlight it finds; It does not have a Choice prompt.
| #!/bin/sh | |
| # Version: 1.0.0 | |
| # INSTALL/UPDATE: | |
| # > curl https://gist.githubusercontent.com/BinToss/ca2b47df31dd7cf13e9fe00f7bbefab4/raw/fullbright.sh -o ~/.local/bin/fullbright && chmod 755 ~/.local/bin/fullbright | |
| # intel_backlight (Intel), amdgpu_bl0 (AMD), nvidia_wmi_ec_backlight (NVIDIA), acpi_video0 (ATI, generic) | |
| # blMgrs=intel_backlight,amdgpu_bl0,nvidia_wmi_ec_backlight,acpi_video0 | |
| blMgrsActual="$(/bin/ls -N1 /sys/class/backlight/)" | |
| blMgr="" | |
| case "$blMgrsActual" in | |
| *"\n"* ) | |
| # TODO: add choice-prompt when multiple backlights | |
| set -- "$blMgrsActual" | |
| blMgr=${1};; | |
| * ) | |
| blMgr="$blMgrsActual";; | |
| esac | |
| if [ "$blMgr" -eq "" ] | |
| then | |
| echo "No backlight selected!" | |
| exit 1; | |
| fi | |
| pathBrightness=/sys/class/backlight/$blMgr/brightness | |
| pathMaxBrightness=/sys/class/backlight/$blMgr/max_brightness | |
| if [ "$(cat "$pathBrightness")" -eq "$(cat "$pathMaxBrightness")" ] | |
| then echo "'$blMgr' is already at max brightness" && exit | |
| fi | |
| # if not root (assuming we must be root to write to backlight) | |
| # then request re-run as root | |
| if [ "$(id -u)" -gt 0 ] | |
| then | |
| if [ -z "$PS1" ] | |
| then pkexec "$0" | |
| else sudo "$0" | |
| fi | |
| exit | |
| fi | |
| echo 96000 > "$pathBrightness" |