I recently installed Slack current on my Gateway Solo 9300.
I used the default 2.6.6 kernel with acpi enabled.
On first boot I had no acpi functions.
A quick dmesg said that my bios was too old but I could
enable acpi by appending lilo to read:
I did so and had acpi.
Ac, battery, button, fan, processor, and thermal were built as
modules. Once I loaded them, I fired up Gkrellm and had not
only battery charge but processor temp as well. In fact I have
everything except fan rpm.