I was running 12.04 for 6 months, my laptop ran almost silently and cool enough to hold on my lap. I updated to 12.10 and now my computer gets too hot to hold on my lap and the fan is constantly running on full blast. This is the output of sensors:

acpitz-virtual-0 
Adapter: Virtual device 
temp1:        +84.0°C  (crit = +99.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +84.0°C  (high = +86.0°C, crit = +100.0°C) 
Core 0:         +74.0°C  (high = +86.0°C, crit = +100.0°C) 
Core 1:         +72.0°C  (high = +86.0°C, crit = +100.0°C) 
Core 2:         +75.0°C  (high = +86.0°C, crit = +100.0°C) 
Core 3:         +84.0°C  (high = +86.0°C, crit = +100.0°C)

radeon-pci-0100 
Adapter: PCI adapter 
temp1:        +76.0°C

I have an HP Pavilion dv6, i7, amd radeon graphics. Please let me know if you need additional information.

What could be different between the two Ubuntu editions that caused such a drastic change?

Edit 1:

Per @Paul's suggestion, I ran htop to try to narrow down the problem. Here is the result!

(left side of terminal)

(right side of terminal)

This is about 10 minutes after boot-up, htop, yakuake, and a chrome page with 1 tab opened to this question are all that I have manually opened. The most taxing program to the CPU is htop itself. I think that the problem must lie elsewhere; my temps are already up to ~65C for the CPU and ~69C for the GPU, with nearly 0% CPU usage.