I played around more with the uefi options and (by sheer luck and intuition) found how to fix this! :-)
In `Advanced->AMD CBS->NBIO Common Options` set `IOMMU = Enabled` (it was disabled by default!) Now SME works fine with Bios Options TSME=Enabled, Scramble=Enabled. ** Changed in: linux (Ubuntu) Status: Confirmed => Invalid ** Changed in: linux (Ubuntu) Status: Invalid => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1879538 Title: System freeze when booting with mem_encrypt=on To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1879538/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs