[ubuntu] suspend works but cant shutdown afterwards

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http://ubuntuforums.org – Running 9.10 on a dell inspiron e1705. It has an ati x1400 and I am using the built in radeon driver. Laptop suspends and resumes almost flawlessly (screen is dim on resume, but keyboard hotkey works to increase it). Problem is, after I have resumed if I try to shutdown the laptop later, the screen freezes with diagonal lines and I have to hard power off. The laptop shuts down w/o issue if I dont suspend at some point. Any ideas where to start looking? (Hardware)