Script to control brightness via command

brightness.ps1

$brightness = (Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightness).CurrentBrightness

if ($args[0] -eq "desc") {
    $brightness = (([int]($brightness / 10) * 10 - 10), 0 | Measure -Max).Maximum
}
else {
    $brightness = (([int]($brightness / 10) * 10 + 10), 100 | Measure -Min).Minimum
}

(Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1, $brightness)

exit

Article: dev.to

Commands:

.\brightness.ps1 <# No agrs will increase brightness #>

.\brightness.ps1 desc <# desc as arg will decrease brightness #>

This is all that I get when I run the code.

Get-WmiObject : Not supported
At C:\users\dbuch\desktop\brightness.ps1:1 char:16

• ... ightness = (Get-WmiObject -Namespace root/WMI -Class WmiMonitorBright ...

•             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  

  • CategoryInfo : InvalidOperation: (:) [Get-WmiObject], ManagementException
  • FullyQualifiedErrorId : GetWMIManagementException,Microsoft.PowerShell.Commands.GetWmiObjectCommand

Get-WmiObject : Not supported
At C:\users\dbuch\desktop\brightness.ps1:10 char:2

• (Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods ...

•  + CategoryInfo          : InvalidOperation: (:) [Get-WmiObject], ManagementException
   + FullyQualifiedErrorId : GetWMIManagementException,Microsoft.PowerShell.Commands.GetWmiObjectCommand
  
  

You cannot call a method on a null-valued expression.
At C:\users\dbuch\desktop\brightness.ps1:10 char:1

• (Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods ...

•   + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull