no lcd backlight after wake / 10.5.7

[mattik]

I've just installed iAtkos v7 10.5.7 Leopard (vanilla kernel, Voodoo PS2 with trackpad plugin, GMA950 Laptop (in fact i have GM945 on board), Voodoo HDA driver, Chameleon 2.0) and everything's working fine... except 'sleep'. Actually it seems to be ok, but after wake I have no backlight so it's very hard to do something as you can imagine any suggestions?
I have been using iAtkos v5i 10.5.5 Leopard (honestly i do not remember what extenesions i used exactly) for half a year before that and i've encountered something similar several times, but most of the time my hackbook was waking up properly.

thanks in advance.