Hi there, As i'm not subscribed to the list, I completely missed on Tobias' messages -- and my previous one must seem strange in hindsight. Sorry about this. I'm now subscribed, but still can't reply directly to his email. Though I still won't be able to answer directly to Tobias' latest email, I will test the patch, and /somehow/ report back on Thursday. For now I must say that on my kernel -- official guix linux-libre-5.4 -- the built-in support does not seem to be working (I'm pretty sure i've tested this); I will double-check however. Kind regards, Jean-Baptiste