[ubuntu] Laptop fan constantly on after update

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http://ubuntuforums.org – I updated my packages today, and after rebooting the laptop's fan is constantly running. Two questions: 1) Is it reasonable for the fan to be running constantly with this sensors output? 2) Which package is likely responsible for changing the fan's behavior? Note 1: I don't think it's the kernel because I rebooted to the previous kernel version and the fan is still going. Note 2: "top" shows the CPU is 98% idle. Sensors output is: acpitz-virtual-0 Adapter: Virtual device temp1: +56.0°C (crit = +105.0°C) temp2: +34.0°C (crit = +105.0 (Hardware)