[ubuntu] HP Pavilion DV8 and Ubuntu 9.10 shutdown issue

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http://ubuntuforums.org – Hi, everybody. I have the last HP Pavilion DV8 with 18,4'' screen's size and i7 core. Manufacturing operating system is Windows 7 Home Premium 64 bits. I tried last Ubuntu 9.10 Live CD (64 bits) and it boots normaly. Wifi is working. But, when I shoutdown or halt system from this Live CD, notebook is halted, but when I switch the notebook ON, BIOS shows an abnormal hibernation or shutdown process ocurred, maybe for an overheating operation. I see this BIOS message is not displayed when I boot Ubuntu LiveCD with ACPI=off option. Do you have the same issue? My BIOS version is F.05. PD: Sorry for my bad english.:( (Hardware)