Windows 10: Enabled the "DMA remapping" for my device driver but I still get the "IOMMU detected DMA...

Hi, I have enabled the DMA remapping for my device driver but I still get the "IOMMU detected DMA violation" error whenever I try to perform any DMA transactions. I have updated the UEFI firmware. The DMA Kernel Protection is ON. The driver shows "DMA remapping policy" enabled. Also, set the group policy 'Disable new DMA devices when this computer is locked' for the BitLocker to "Disabled". Driver Verifier is running. Any idea why still get the error DRIVER_VERIFIER_DMA_VIOLATION? The device get enumerated but it fails on DMA operations. Curiously enough, I thought I wouldn't be able to access

:)

 

DMA Devices?

When I go to "System Information" and expand the "Hardware Resources" tab and then click "DMA" (Direct Memory Access), the panel that lists the devices is blank, i.e. no devices are shown.

Since my hdd, ssd, NIC, sound card etc. normally are supposed to use DMA, I'm not sure why I'm not seeing them listed.

I checked Device Manager but there doesn't appear to be any way to verify if DMA is being utilized. I recall in prior versions of Windows, Device Manager would display a check box in one of the tabs for a specific device, that would indicate if DMA was active, but I don't see this feature in Windows 10.

Is there any other way to verify whether or not devices on my computer are utilizing DMA?

Thanks.

Bob

 

Dma ?

On my sys. (sys. listed), how do I enable or disable DMA on my Sata drives? I have a Sumsung SH-S203b Dvd recorder (sata) and in the Nero info tool I get a warning that DMA is disabled on this drive. On my old sys. (P4C800-E Deluxe) the Intel raid driver software provided control of dma. On the P5K Deluxe where do I find the drive settings (DMA or PIO) and how would I change them?

Thank You.

 

DMA controller

Hi,



I realized your concern and will assist you to resolve the issue.



If you enable DMA for some reason if there is a problem with the hardware or drivers, DMA can malfunction and lead to hardware failure. So you may consider need to disable DMA.



Your reply is very important for us to ensure a proper resolution. Please get back to us with the above information in order to assist you accordingly.

Thanks and regards.