At least on Apple’s iBook, LXDE/LXDM are not yet recommended. Even though I appreciate lean desktop environments with keyboard shortcuts there are at least these issues:
- Multiple screensavers are running and locking the display. Try to reduce that to
xscreensaverwhich is configurable in LXDE/OpenBox.
- Gnome’s Power Manager is still running, but will fail on suspend in contrast to the combination GDM/Gnome.