====== Linux on a laptop on a beamer ======
To use a beamer, aticonfig can be a help:

  - Boot normally
  - Choose a screen resolution the beamer understands (in my case: 1280x800->1024x768). The laptop screen might look strange, but that's ok for now
  - Attach the VGA cable from the beamer
  - ''DISPLAY=:0 aticonfig --query-monitor'' (gives a list of attached devices, e.g. lvds and crt1)
  - ''DISPLAY=:0 aticonfig --enable-monitor=lvds,crt1 --effective=now'' (turns on beamer)
  - ''DISPLAY=:0 aticonfig --enable-monitor=lvds --effective=now'' (turns off beamer)

Allowed entities are: none,crt1,crt2,lvds,tv,tmds1,tmds2,auto

Note: Only two devices can be active at the same time.