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Yes, but I don't know enough about modern monitor connections to know whether the monitor being on will inhibit the system from suspending. The docs for XFCE talk about preventing inconsistent configuration timings of the several modes, but I don't know (not using XFCE) how far this is carried between display management and system power management, or between the kernel's, X's, and XFCE's controls. Sorry not to be more help. Cheers, David.
