[xubuntu] long/wrong "w" command idle time for X sessions

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http://ubuntuforums.org – Figured I'll ask here before doing a bug report... Symptom: "w" reports indefinitely increasing idle time for X users since last boot (idle times for text console logins are normal). Cause: atime on /dev/tty7 that X is on is not getting bumped. Suspected cuplrit: Xorg Config: 12.04.1 w/ slim display manager and fvwm window manager via traditional Xsession setup. I first noticed some problems after upgrading to 12.04 from 8.04 when idle times would intermittently not update (and hence continue to grow). I had originally faulted console-kit, as I seem to recall restarti (Hardware)