Ubuntu

cpu fan at maximum after suspend to memory

Reported by Petr Kopač on 2009-01-27
10
This bug affects 2 people
Affects Status Importance Assigned to Milestone
acpi (Ubuntu)
Undecided
Unassigned

Bug Description

Ubuntu 8.10, kernel 2.6.27-11
When I suspend my computer (Intel Core 2 Duo e8400 @ 3.6 GHz) to memory and wake it up, the cpu fan, which is set to Silent mode (low RPM) in BIOS, is rotating at maximum, which is quite loud. I think it is supposed to return to normal state. It's not because some crashed application would take too much processor power, its usage is circa at 0-5 %. The folders /proc/acpi/thermal_zone/ and /proc/acpi/fan/ are empty. But it's probably something with those ACPI things. Any suggestions? Thx

Note: Bug # 37132 seemed similar, but I've got another piece of hardware etc.

VladimirCZ (vlabla) wrote :

I have the same problem with Ubuntu 10.04 64-bit, kernel 2.6.32-22-generic, fully updated + HP Probook 4510s, Celeron(R) Dual-Core CPU T3000 @ 1.80GHz, Mobile Intel Graphics Media Accelerator 4500MHD integrated graphics, Product Code VQ540EA#AKB.

VladimirCZ (vlabla) wrote :

I have found that this happens only with a default value of the BIOS option "Fan always on while connected to an AC
outlet" = Enable. If disabled the fan starts resuming at hight speed (BIOS?), but soon it slows down (linux?). It is surprising, that such a value is pre-set on a machine delivered originally with a SLED linux installation. Anyway, I will test also behaviour when on battery ...

Dave (david-ayres3) wrote :

I also run an HP Probook 4510s and can confirm this issue. If you unplug the power cord, the fan will reduce to the normal rate.

Can you control fan speed through terminal(manual is here: http://tuxtweaks.com/2008/08/how-to-control-fan-speeds-in-ubuntu/ )?

Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in acpi (Ubuntu):
status: New → Confirmed
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