in debian9 Xorg works OK but in debian12, when I start X, I view desktop(fluxbox) but system freeze, I have to poweroff what do you suggest I try?
Are you using the built-in ATi Rage128 or a Creator3D card? I'm not familiar with recent Debian installations on the Ultra10 due to kernel stability issues and lack of time, so I don't know about the Rage128. The kernel config mentions that this driver is unsupported and "dangerous", so that may be one reason. If you're using a Creator3D, I'm surprised that you got it working at all. I had limited success with a revived sunffb driver (it was removed from Xorg some years ago, although I think someone has recommenced work on it recently), but while it displayed something and didn't freeze the system, interaction with the Xorg desktop wasn't possible.
