My laptop don't detect projectors

[zchronos]

My laptop Toshiba Satellite A505-SP6022L with:

S.O: openSUSE 11.4 (x86_64)
Kernel: 2.6.39-rc5-16-desktop
D.E: KDE 4.6
Chip: Nvidia GeForce 310M
Driver: NVIDIA-Linux-x86_64-270.41.06.run

I connect a projector (epson, viewsonic, etc) with cable VGA and my laptop don't detect. I press Fn + F5, also, restart the session, also press the button "Search Source" from projector, but nothing.

Note: In a HP Pavillion DV6420LA with "Nvidia GForce Go 6150" and openSUSE + KDE4 the projectors works good (cable VGA).