When I boot the 'pi with the cable attached, it comes up nicely in 1280x1024 as I told it to:
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hdmi_drive=1 hdmi_group=2 hdmi_mode=35 hdmi_force_hotplug=1 config_hdmi_boost=4 disable_overscan=1
However, somehow, the mode drops to a 60Hz 1280x720 mode when the monitor is not connected during boot. I was hoping to prevent these problems by specifying hdmi_force_hotplug=1, and directly specifying a mode that I want.
Why does it drop to a lower resolution if the monitor is not connected?
Just to be sure: the /proc/cmdline file shows "fbheight=720", so it is not my VGA converter that isn't booted correctly and somehow converting the 1280x1024 mode into 1280x720 (as if such a cheap piece of electronics would be capable of such a feat).