Usage

PS> .\enable-msi.ps1 <vendor-id>:<device-id> [<vendor-id>:<device-id> ...]

Example

PS> .\enable-msi.ps1 10DE:1D01 8086:A348

Processing device 10DE:1D01.
└ Found instance: VEN_10DE&DEV_1D01&SUBSYS_8C981462&REV_A1\4&3335b6e8&0&00E0
  MSI is currently disabled; turning it on.

Processing device 8086:A348.
└ Found instance: VEN_8086&DEV_A348&SUBSYS_1A1D15D9&REV_10\5&226b9205&0&E008F0
  MSI is already enabled; skipping instance.

Group Policy Deployment

💡 Since a device's MSI flag gets reset whenever its driver is updated, setting the script to run automatically at shutdown/startup ensures MSI stays enabled.

1. Decide whether to deploy as a shutdown or startup script. Shutdown is recommended as MSI is enabled at the next startup, while this takes an extra reboot with a startup script.

2. Install enable-msi.ps1 to \\<domain>\SYSVOL\<domain>\Policies\<policy-guid>\MACHINE\Scripts\<Shutdown|Startup>.

3. In Group Policy Management Editor (gpedit.msc):

   Computer Configuration ➡ Policies ➡ Windows Settings ➡ Scripts (Startup/Shutdown) ➡ <Shutdown|Startup> ➡ PowerShell Scripts ➡ Add...

   • Script Name: enable-msi.ps1
   • Script Parameters: <vendor-id>:<device-id> [<vendor-id>:<device-id> ...] (e.g. 10DE:1D01 8086:A348)

Mode of Operation

The script finds devices with the given PCI IDs in the registry and sets their MSISupported property to 1, creating intermediate keys as needed.

HKLM\SYSTEM\CurrentControlSet\Enum\PCI\<device-instance-path>\Device Parameters\Interrupt Management\MessageSignaledInterruptProperties

• MSISupported (DWORD): 0 ➡ 1