I ended up doing two things to finally get Device Encryption enabled. First, in the BIOS I turned on Secure Boot. Unfortunately that did not solve the problem (but I think it is necessary). Second, I followed this article on Super User very closely. In fact I used this person’s PowerShell script: [URL] First though I had to follow the Microsoft article on giving myself Owner of that key in the Registry. Then I was able to import the addition Allowed DMA Devices into the registry. This was like the journey to Mordor but I finally got it working, now the data on my drives is protected!
I would like to use Windows 11 Device Encryption with my Alienware m15 R1 laptop. However it is not showing up as an option in Settings. I have UEFI mode on and TPM enabled. I went through the process of enabled TPM support in the BIOS before I upgraded to Windows 11. Also in System Information under Device Encryption Support I have this message:     Also, further research indicates that I may need "Modern Standby" mode available. Something about S0 vs S3. Is it possible to turn this on with an m15? If not, would BitLocker work (if I upgrade to Windows 11 Pro)? Is there another way to get Device Encryption (which is included with Windows 11 Home) turned on without enabling "Modern Standby"?
m15 R1, turn on Device Encryption in Windows 11 Home