NirCmd Command Reference - setbrightness

setbrightness [level] {mode}
This command only works on laptop/netbook computers. It allows you to set the brightness of the laptop screen. The [level] parameter is brightness value between 0 and 100. 0 = very dark, 100 = very bright.
{mode} is optional parameter that may conatin the following values:
1 = Change the brightness under AC power.
2 = Change the brightness under DC power.
3 = Change the brightness for both AC power amd DC power (The default).
Examples:
setbrightness 50
setbrightness 40 1
setbrightness 60 2

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