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Lenovo BIOS Settings and PowerShell

Automation with the Lenovo BIOS PowerShell classes.

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Starting with the T/W/X/L x30 series, Lenovo provides WMI classes to modify BIOS/UEFI settings directly from the operating system. The classes are located in the namespace “root\wmi”.

Read BIOS settings

To read a list of all BIOS settings including their current values, the WMI class “Lenovo_BiosSettings” is used. For better readability, the output is slightly modified and “,” is replaced by “=”.

Get-WmiObject -class Lenovo_BiosSetting -namespace root\wmi | ForEach-Object {if ($_.CurrentSetting -ne "") {Write-Host $_.CurrentSetting.replace(","," = ")}}

Set BIOS settings

Two steps are necessary to set or modify BIOS settings. In the first step, a setting is changed via the class “Lenovo_SetBiosSettings”…

$Bios = Get-WmiObject -class Lenovo_SetBiosSetting -namespace root\wmi
$Bios.SetBiosSetting("WakeOnLAN,Enable")

… and in the second step it is saved with “Lenovo_SaveBiosSettings”.

$Bios = Get-WmiObject -class Lenovo_SaveBiosSettings -namespace root\wmi
$Bios.SaveBiosSettings()

Exceptions

A handful of security settings can’t be modified via the WMI classes. For example, the “Secure Rollback Prevention”.

Sources