I have a Gigabyte GA-890GPA-UD3H motherboard and Phenom II X6 in my desktop computer, and it's all working well, except that Ubuntu 10.10 doesn't seem to detect any ACPI support at all: it can't suspend, and it can't measure its internal temperatures. I would have thought a new device like this ought to have pretty pervasive ACPI support?
For temperatures, you must install lm-sensors package
Then follow this guide https://help.ubuntu.com/community/SensorInstallHowto