Thank You Simon for Your support! I saw You re-addressed the bug to the right package.
I've also found there is something wrong with nouveau driver itself. Whenever I run my old 5.13 kernel I have three monitors active. When I boot the 6.1 kernel from Bookworm distro, the nouveau output is blank with a white screen. When I've tried to swap nouveau driver with nvidia from nvidia-kernel- dkms package - it worked, but the signal was only on the nvidia output (1 monitor out of 3). The intel GPU outputs remained off. But that's another story, to be addressed elsewhere. Perhaps to a kernel developers. Brgds Mike
