rpm-ostree kargs can be used to add/remove kernel argumentsrpm-ostree kargs --editor.rpm-ostree, thanks
video=<output>:<resX>x<resY>@<refreshrate>,<sameoutput>:<resX>x<resY>@<refreshrate>rpm-ostree kargsrpm-ostree kargs --editorrpm-ostreevideo=<output>:<resX>x<resY>@<refreshrate>,<sameoutput>:<resX>x<resY>@<refreshrate>