`AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=y` causes AMDGPU to fail on Ryzen: amdgpu: SME is not compatible with RAVEN

Tue Oct 5 14:29:41 UTC 2021

Dear Tom, dear Linux folks,

Selecting the symbol `AMD_MEM_ENCRYPT` – as done in Debian 5.13.9-1~exp1 
[1] – also selects `AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT`, as it defaults 
to yes, causing boot failures on AMD Raven systems. On the MSI B350M 
MORTAR with AMD Ryzen 3 2200G, Linux logs and the AMDGPU graphics 
driver, despite being loaded, does not work, and the framebuffer driver 
is used instead.

     [   19.679824] amdgpu 0000:26:00.0: amdgpu: SME is not compatible 
with RAVEN

It even causes black screens on other systems as reported to the Debian 
bug tracking system *Black screen on AMD Ryzen based systems (AMDGPU 
related when AMD Secure Memory Encryption not disabled -- 
mem_encrypt=off)* [2].

Should the default be changed?

Kind regards,

Paul

[1]: 
https://salsa.debian.org/kernel-team/linux/-/blob/master/debian/changelog#L1138
[2]: https://bugs.debian.org/994453