There is still something in screen and backligth. When I try to switch off backlight with aplet screen goes off too. When I use ison in Setihgs tab screen switches off one level obove "no backlight.
My Wifi card,TRENDnet TEW-222CF, is not initialize by the Z. I think it was dual power card, 3.3V & 5V. May be this is the problem.
I supose that i should report this in some bug tracker but i dont know where. I supose these are related with 2.6 kernel.