dnardi212

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I'm having an issue with speed on a Dell C840 laptop running Ubuntu 9.04. I have found that it seems to want to throttle the CPU down as soon as the fan kicks in. When the temperature goes past 50C, the fan will start at full speed and the system will throttle down to state P6 (25%) as seen in the /proc/acpi/.../throttling file. Once the temperatur goes down (even below 43C), the fan never turns off and the throttling state never comes back to P0 (100%), so the system run poorly from that point out.

I was running 8.04 and the system worked fine for the longest time - fans came on and off as needed and never saw the throttling issue. I noticed this happening at some point (I assume I received an update, but don't know which one) and it's been happening ever since. I upgraded to 8.10 and it continued to happen and then upgraded to 9.04 this last week and it's still happening. I can watch the throttling file and as soon as the fan kicks in I see the state change.

I want to turn off this throttling control, as the laptop seems to run pretty cool. It's not under heavy use and if I can get the fans to come on and off as they did that would be great. It normally runs below 50C so I'm not concerned about overheating.

Any help will be very appreciated.