Experimente Screenbright , Display Tuner para ajuste de brilho ou tente script powershell para controle de brilho
function Set-MonitorBrighness {
[CmdletBinding()]
param (
[ValidateRange(0,100)]
[int]$brightness
)
$mymonitor = Get-WmiObject -Namespace rootwmi -Class WmiMonitorBrightnessMethods
$mymonitor.wmisetbrightness(5,$brightness)
}
Set-MonitorBrighness -brightness 1