the 2 monitors are connected to the same nvidia gt 730 card :
iiyma one is connected to the dvi plug
philips one is connected to the vga plug
many of the time i don’t use the philips one then i inactivate it in kde settings and i switch off it
in kde settings the iiyama one is the primary screen
when i boot the kdm template is displayed to the philips monitor !
then i fill the password without seeing anything
then the desktop is displayed to the iiyama monitor .
how at boot to display the kdm template to the iiyama monitor ?
There may be a BIOS setting to tell the system to use the DVI socket as monitor 0, maybe??? Also may be done in xorg.conf if the problem is after X is loaded. Before X is loaded the BIOS defines things
Not that I know the answer about your oroginall qusetion, but the above ssuggestion can only be false. Those KDE settings are user settings (every user can set them different for his own purposes). kdm (like all displaymanagers) is a system feature (running as root) to facilitate login before it is even known which user will login (and thus which user settings to obey) and it is also not sure which desktop that unknown user is going to use.
I gues that when it is possible what you want, it is either configurable in a general displaymanager configuration file (like /etc/sysconfig/displaymanager, but I could not find an entry for it there) or in a specific kdm configuration file.
PS - if you’re using the prop. nvidia driver, then you might want to check the nvidia-settings (i.e. what monitor has the nvidia driver set as primary) …