Running an Acer 5920 laptop. Fan is howling. It's been running Ubuntu 10.04 for the last year or two. With 10.04 the fan was almost inaudible most of the time. In the last week I've tried Ubuntu 11.10, Xubuntu 11.10, Mint 11, and now Mint 12 w/ Cinnamon. Fan ramped up under all of these OS'es, but after installing Cinnamon it appears to have ramped up a little more. Doesn't make any sense that Cinnamon would change fan speed, does it?
I tried setting up pwmconfig, but there are no pwm-capable devices.
lm-sensors picks up just one module, "coretemp".
I installed xsensors, which says CPU temp is 40.0 deg. C
gkrellm sez CPU usage is low. Barely bounces off 0% at an idle.
I disassembled the lappy last week to replace the CMOS battery, which is cleverly situated in the deepest depths. Cleaned out the CPU fan/heat tube/exhaust grill (not much dust) and applied a dab of Arctic Silver thermal paste in place of the original heat pad.
Does anyone have any ideas? I've got the laptop setting here next to me idling. Fan speed hasn't changed one bit in an hour.
EDIT: I pulled the HDD running Mint 12, replacing it with the OEM HDD. The OEM HDD still has Ubuntu 8.04 on it. The fan fell to "almost inaudible" as soon as 8.04 booted up. So to this amateur it sure looks like something in the newer kernels that's not controlling the laptop fan as well as older kernels did.