cannot suspend travelmate290

[pol]

Suspend to disk and suspend to ram do not work on my acer travelmate 290,
with freshly installed kubuntu gutsy (kernel  linux-generic                             
2.6.22.14.21 installed with   linux-restricted-modules-generic)
Both kpowersave and kde-guidance-powermanager lock the sceeen rather than
suspending. 

Kpowersave settings reports that cpu scaling is not supported. But
travelmate290 is centrino based laptop, therefore cpu scaling is supported
by the hardware, isn't it? Any missing packages?

Thank you 

--
Pol