shr- avoid suspend and dim screen

[Fernando Martins]

Ah! I forgot to tell: I'm using shr unstable from January and the 
settings UI doesn't work, , so I was looking for a command line 
instruction to suspend on/off.

Unfortunately, suspend off is not sufficient since the battey gets 
drained too fast, in a couple hours while using GPS. I don't know how 
much power the GPS and CPU is being used, but I'm sure switching off the 
screen would help.

Fernando