I would suggest specifying output in video parameter, like this:
To see what outputs are named on your system, check /sys/class/drm/ directory. For example on my system it contains entries card0-LVDS-1, card0-SVIDEO-1, card0-VGA-1. This translates to LVDS-1, SVIDEO-1, VGA-1 (without the prefix) in the kernel parameter.Code:video=LVDS-1:1280x1024-24@60e
More info on what it actually means here: https://wiki.archlinux.org/index.php/KMS#Forcing_modes


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