Now compile regularly, but yesterday evening I had to interrupt the procedure because I was compiling from Daniel Pocock's 5.9.6 kernel and being that the compilation in the case of Debian switches the GPU off and on several times, I could no longer continue since kernel 5.9. X on Power suffers from this bug, if you turn off the GPU or when switching to the video output of the GPU, the monitor goes black and it is no longer possible to do anything. I found the same problem on Fedora so I realized that the problem lies in the Linux Power Kernel in version 5.9.X. In fact, every time I load Debian with 5.9 I always have to switch the video output first otherwise it crashes irreversibly ... Today I try to do everything from 4.19 and I will let you know thanks Xlinder. In which line of the kernel configuration I understood that I had to put only double quotes for that I asked you to write me exactly what I had to put. Tonight I try and tell you. Thanks for everything always.