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126 lines
3.6 KiB
126 lines
3.6 KiB
+++
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title = 'Backlight control on a Lenovo X1 Carbon'
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aliases = '/posts/2023-05-28-backlight-control-on-a-lenovo-x1-carbon'
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summary = '''These two scripts let the X1 switch to a predefined setting for
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battery or ac mode. It also remembers the last used setting for either mode.'''
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date = '2023-05-28T17:35:45+02:00'
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# lastmod = ''
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categories = [ 'computerstuff' ]
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tags = [ 'freebsd', 'scripting' ]
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+++
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I like to have my computer reduce the screen brightness when it's not
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connected to an external power source.
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## powersave.sh
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This is (mainly) used to control Intel SpeedStep®. I tend to save my custom
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applications and scripts in `$HOME/bin`. Saved as `$HOME/bin/powersave.sh`.
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```sh
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#! /bin/sh
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case $( sysctl -n hw.acpi.acline ) in
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(0) # BATTERY
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doas sysctl dev.hwpstate_intel.0.epp=100 1> /dev/null 2> /dev/null
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doas sysctl dev.hwpstate_intel.1.epp=100 1> /dev/null 2> /dev/null
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doas sysctl dev.hwpstate_intel.2.epp=100 1> /dev/null 2> /dev/null
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doas sysctl dev.hwpstate_intel.3.epp=100 1> /dev/null 2> /dev/null
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doas sysctl dev.hwpstate_intel.4.epp=100 1> /dev/null 2> /dev/null
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doas sysctl dev.hwpstate_intel.5.epp=100 1> /dev/null 2> /dev/null
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doas sysctl dev.hwpstate_intel.6.epp=100 1> /dev/null 2> /dev/null
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doas sysctl dev.hwpstate_intel.7.epp=100 1> /dev/null 2> /dev/null
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#backlight 20 1> /dev/null 2> /dev/null
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backlight $(cat ${HOME}/.backlight-bat) 1> /dev/null 2> /dev/null
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;;
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(1) # AC
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doas sysctl dev.hwpstate_intel.0.epp=0 1> /dev/null 2> /dev/null
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doas sysctl dev.hwpstate_intel.1.epp=50 1> /dev/null 2> /dev/null
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doas sysctl dev.hwpstate_intel.2.epp=100 1> /dev/null 2> /dev/null
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doas sysctl dev.hwpstate_intel.3.epp=100 1> /dev/null 2> /dev/null
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doas sysctl dev.hwpstate_intel.4.epp=100 1> /dev/null 2> /dev/null
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doas sysctl dev.hwpstate_intel.5.epp=100 1> /dev/null 2> /dev/null
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doas sysctl dev.hwpstate_intel.6.epp=100 1> /dev/null 2> /dev/null
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doas sysctl dev.hwpstate_intel.7.epp=100 1> /dev/null 2> /dev/null
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#backlight 100 1> /dev/null 2> /dev/null
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backlight $(cat ${HOME}/.backlight-ac) 1> /dev/null 2> /dev/null
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;;
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esac
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```
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The script is run by a line in my personal cron table. A little delay (up to
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a minute) is expected.
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```crontab
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* * * * * ~/bin/powersave.sh
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```
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## xbl
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A script to modify different backlight settings depending on the connected
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power source. Saved as `$HOME/bin/xbl`.
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```sh
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#! /bin/sh
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print_usage () {
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echo >&2 "usage: $(basename ${0}) [0..100]"
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exit 1
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}
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# check if argument given or not (list or set value)
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if [ $# -eq 1 ]
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then
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# set value (select between ac or bat mode)
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# check if argument is integer between 0,100
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if [ "$1" -eq "$1" ] 2>/dev/null
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then
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if [ "$1" -ge 0 ] && [ "$1" -le 100 ] 2>/dev/null
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then
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# argument given and between 0,100
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case $( sysctl -n hw.acpi.acline ) in
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(0) # BATTERY
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echo "$1" > ${HOME}/.backlight-bat
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;;
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(1) # AC
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echo "$1" > ${HOME}/.backlight-ac
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;;
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esac
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backlight "$1"
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else
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# arg not between 0 and 100
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print_usage
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fi
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else
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# arg not an integer
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print_usage
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fi
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else
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# no args given, only list values
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case $( sysctl -n hw.acpi.acline ) in
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(0) # BATTERY
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current=bat
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;;
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(1) # AC
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current=ac
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;;
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esac
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for status in ac bat
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do
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if [ "${status}" = "${current}" ]
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then
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echo -e "${status}: ★ \t$( cat ${HOME}/.backlight-${status} )" | tr "[:lower:]" "[:upper:]"
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else
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echo -e "${status}:\t$( cat ${HOME}/.backlight-${status} )" | tr "[:lower:]" "[:upper:]"
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fi
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done
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fi
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```
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