Ok. According to https://wiki.gentoo.org/wiki/AMDGPU disabling SME is needed for AMDGPU: "Currently, amdgpu does not work with AMD Secure Memory Encryption (SME) enabled, so you need to disable its use either in the kernel configuration or on the kernel command line (i.e. in /etc/default/grub as part of GRUB_CMDLINE_LINUX)."
Ok. According to https:/ /wiki.gentoo. org/wiki/ AMDGPU disabling SME is needed for AMDGPU: "Currently, amdgpu does not work with AMD Secure Memory Encryption (SME) enabled, so you need to disable its use either in the kernel configuration or on the kernel command line (i.e. in /etc/default/grub as part of GRUB_CMDLINE_ LINUX). "