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46 lines
1.3 KiB
Bash
46 lines
1.3 KiB
Bash
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#!/bin/bash
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#
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# Author : Gaston Gonzalez
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# Date : 16 January 2023
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# Updated : 16 March 2024
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# Purpose : Fix screen brightness on Panasonic hardware
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#
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# Note: This fix is based on the following article:
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# https://www.bobjohnson.com/bloghow-to-install-ubuntu-on-a-panasonic-toughbook-cf31/
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PATH=/opt/emcomm-tools/bin:$PATH
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WatchDriver="/sys/class/backlight/panasonic"
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PatchDriver="/sys/class/backlight/intel_backlight"
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if [ ! -d $WatchDriver ]; then
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et-log "This is not a Pansonic system. Exiting."
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exit 1
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fi
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if [ ! -d $PatchDriver ]; then
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et-log "Patch driver directory does not exist: ${PatchDriver}"
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exit 1
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fi
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# Get maximum brightness values
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WatchMax=$(cat $WatchDriver/max_brightness)
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PatchMax=$(cat $PatchDriver/max_brightness)
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SetBrightness () {
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# Calculate watch current percentage
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WatchAct=$(cat $WatchDriver/actual_brightness)
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WatchPer=$(( WatchAct * 100 / WatchMax ))
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# Reverse engineer patch brightness to set
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PatchAct=$(( PatchMax * WatchPer / 100 ))
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echo $PatchAct | sudo tee $PatchDriver/brightness
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}
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# When machine boots, set brightness to last saved value
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SetBrightness
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# Wait forever for user to press Fn keys adjusting brightness up/down.
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while (true); do
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/usr/bin/inotifywait --event modify $WatchDriver/actual_brightness
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SetBrightness
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done
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