[ubuntu] hibernation on hp nc4200 = no LCD ?

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http://ubuntuforums.org – Hi all, At last week I tried the ubuntu 9.10 on my hp nc4200 notebook. I'm using 9.04, so I not upgraded to 9.10. Fresh, virgine HDD, install from original CD, update from net, and the 9.10 ready to start... but... It seems like to work correctly, network, audio, and everything, but the first different between 9.04 and 9.10, when I close the notebook, the 9.10 will be hibernate my pc... When I try to wake up from hibernation, the lcd didn't wake up. Power off... power on... no lcd backlight... I try the followings: - boot from 9.04 live cd - boot from the old 9.04 hdd - boot from 9.10 live cd - boot from the installed 9.10 hdd after lots of boots and restarts, the lcd didn't wake up... What can I do to solve this problem? At this moment my notebook is unuseable. :( I've meet the similar problem on my girfriend's hp nc6220 with 9.10, but that's machine can wake up after power off-on. If I try to hibernate my old notebook (hp nc6120) with 9.10, I can wake up it without any problem. (Hardware)