I created this task in PowerShell that adjusts the brightness at startup to Microsoft Windows 10 V1809.
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe "(Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,100)"
- Run "C:\Windows\System32\taskschd.msc"
- Right click on Task Scheduler and select create task
- I used "ScreenBrightness" for the task name
- Select "Run whether user is logged on or not"
- Select "Run with highest privileges"
- Click on "Triggers" tab
- Click on "New"
- Choose "Begin the task: "At Startup"
- Click on "Okay"
- Click on the "Actions" tab
- Click on New
- Past the command into the Program/Script Line
- Click on Okay
- Click on Yes
- Enter your Windows user password
- Click on okay.
When you restart your computer the screen brightness will change to 100% (1,100)