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[ubuntu] CPU Fan not working in 9.10, Overheats!

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http://ubuntuforums.org – I have an Acer Aspire 5315-2940 I've recently upgraded to 9.10. However, the CPU fan doesn't spin up ever since I've upgraded from 9.04. Subsequently the CPU overheats and and the laptop shuts down. What boggles my mind is that the cpu fan with the 9.10 live CD works perfectly. I took a look and when I cat /proc/acpi/thermal_zone/TZ01/cooling_mode it says: <setting not supported> How to I get this working? Any Ideas? (Hardware)