2

I have a 2019 ThinkPad X390 with Windows 10 and want to install Ubuntu. I have always used Legacy Boot previously, not UEFI, and want to see how to have that option. In the UEFI-BIOS, I can see that the option to change UEFI/Legacy Boot from UEFI Only to `Legacy Only' is not selectable and beside it is written the text

Unselectable for Kernel DMA Protection

How can the option to change this be enabled?

K7AAY
  • 17,705
BlandCorporation
  • 624

1 Answers1

2

I had same Problem on my Lenovo t490. I just went under the tab Security and the Virtualization, there was the option Kernel DMA Protection, and I switched it off. Now I'm able to switch legacy mode on.

Eliah Kagan
  • 119,640
Simon Leegaard
  • 21