Comment # 25 on bug 1225296 from Martin Schmidt

Hi, I tried to continue. A brandnew system setup reveals the same shortcoming -
only one display. Now I tried to disable nouveau. I downloaded the nvidia
driver installer selected for my graphics card. After booting with nomodeprobe
and blacklisting the nouveau-driver (this was done by the nvidia installer) I
get a 640x480 display. Now I tried to build the nvidia driver into the kernel.
After installing the kernel souces and devel-files, the build fails, since
<stdarg.h> is not found. After linking <path>/linux/stdarg.h to <path>/stdarg.h
this error is gone. Now <asm/kmap_types.h> is missing. Indeed, this is not
among the kernel source files. For Redhat, I find in some forum that this file
is removed from the kernel distribution. May be the kernel driver installer
does not work for the 6.4-kernel? Also on a 5.14-machine the missing include
file is not there. But here a more recent nvidia-driver is installed for the
gpus. 

In summery I am tempted to give up and find another graphics card. 

Thanks to all for their input and help. 

Cheers,
Martin