Hi, I have noticed following behavior regarding gnome-screensaver and 
gnome-power-manager on my laptop. 
If I switch from internal display to external one and then close the lid of the 
laptop then screensaver only shows blank screen instead of selected theme. If I 
open the lid while screensaver is still on then the selected screensaver theme 
is activated and stays on after I close the lid. If I stop the screensaver by 
moving mouse and let it start again while lid is closed only blank screen is 
activated. Also Gnome-Power-manager doesn't switch off external display after 
the idle time set in the parameters, the external display stays always on if I 
close the lid of the laptop or/and I switch off internal display. There must be 
some logic in gnome-screensaver and gnome-power-manager that looks if laptop 
internal screen is off or if the lid is closed and then it does not activate 
screensaver or DPMS features because they are not needed. Problem is that if 
one uses external display with internal laptop display swithced off or lid 
closed screensaver should be activated and DPMS should still work for external 
display. I think gnome-screenasver and gnome-power-manager code should be 
changed to become aware of the display that is being used and if the external 
display is used they should ignore on/off status of internal display or lid 
position.
I have noticed that if I switch the internal display to external display while 
my laptop lid is closed and after external display is activated then I kill 
gnome-screensaver and start it again then screensaver is working properly on 
external display despite the fact that laptop lid is closed. I have tried same 
procedure with gnome-power-manager but it doesn't help with it.

I use ubuntu 9.10 on Samsung Q35 laptop.

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Lock Screen blanks screen instead of showing screensaver (on external monitor)
https://bugs.launchpad.net/bugs/71030
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