Windows 10 SandBox IOMMU Issue

Does Windows Sandbox 1903 support IOMMU ?
Even when I have IOMMU enabled in bios and it detected in System Devices with newest AMD Driver installed it says the device is not working because it doesn't have resources . but no Question mark or anything , just normal.

I am getting this in Event Viewer when opening Sandbox

DxgKrnl Event ID 445
Creation of a virtual GPU on the adapter (0xffffc888cad0a000) failed with the status (3221225485), reason (DXGK_VGPU_FAILURE_IOMMU_ENABLE)

no one have this error in the Event Viewer specifically only in the Custom Views Administrative Events

I just checked the event viewer for the time I had the Sandbox feature enabled and tested with and without vGPU enabled ( I subsequently disabled Sandbox because I couldn't run VirtualBox whilst Sandbox was enabled ), and I did not get any 445 errors logged. Also Vt-d is a requirement for Sandbox so it must necessarily support it.

Sorry, I have no idea why you might be getting those errors - maybe if you run Systeminfo.exe it may give you some idea ?

das10 said:

I just checked the event viewer for the time I had the Sandbox feature enabled and tested with and without vGPU enabled ( I subsequently disabled Sandbox because I couldn't run VirtualBox whilst Sandbox was enabled ), and I did not get any 445 errors logged. Also Vt-d is a requirement for Sandbox so it must necessarily support it.

Sorry, I have no idea why you might be getting those errors - maybe if you run Systeminfo.exe it may give you some idea ?

I have amd 1950. virtualization is enabled. iommu is enabled. when you run systeminfo what does it say for you. did you make sure vgpu is enabled? you need to run wsb file and write the code there.

When I tested Sandbox, I did it with different wsb config files, some with <VGpu>Default<VGpu> and others with <VGpu>Disable<VGpu> . As I said I no longer have Sandbox enabled as I could no longer run VirtualBox with it enabled. Currently the relevant section of my Systeminfo (with Vt-d enabled) reads:

Hyper-V Requirements: VM Monitor Mode Extensions: Yes
Virtualization Enabled In Firmware: Yes
Second Level Address Translation: Yes
Data Execution Prevention Available: Yes

When I have the Sandbox installed then nothing is available to view
Hyper-V Requirements: A hypervisor has been detected. Features required for Hyper-V will not be displayed.

I am 100% it can't be something related to AMD as it's the same thing. but I can't find anyone else who have it installed and can check it... it's like impossible out of all people who have systems....