[ubuntu] Problem after suspend

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http://ubuntuforums.org – Hello~ I'm working on my acer laptop with karmic amd64 version and something really bothers me. My laptop suspends, resumes and seems to work smoothly. But the fact is that if I switch to tty1(Ctrl+Alt+F1) or exit gnome shell(such as shut down), it crashes. All keys seem to be locked, while the caps indicator is flashing. The screen is a mess too. Hibernation works well. I'm looking forward to you suggestions~ Info about my laptop: Acer Aspire 3104 NWLC/Mobile Sempron 3500+/ATI Mobility X1300/1.5 GB Ram (Hardware)