It's been a good while since I've had to mess with X initialization so I could be wrong, but doesn't Xsession run after user login (and xsession selection)...so the settings won't affect the display/login manager (at least that would explain why the settings don't affect the login screen).
I would at least try putting the monitor/device configuration in /etc/X11/xorg.conf.d/ rather than /etc/X11/Xsession.d/
I would at least try putting the monitor/device configuration in /etc/X11/xorg.conf.d/ rather than /etc/X11/Xsession.d/
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