Notebook CPU fan stays off after resuming from hibernate

[mtvoid]

Binary package hint: acpi-support

I have a Lenovo 3000 N100 (model 0768AQ1). The system seems to hibernate fine, but I have noticed that when the system resumes after hibernation, the CPU cooling fan no longer works, and the CPU temperature keeps on rising. This can be quite serious, as the CPU may easily overheat. I have found a way to reset normal operation of the fan though, by disconnecting the AC power. The fan immediately kicks in when I do that, and then I can reconnect the AC power, and normal fan operation continues thereafter. The other thing I've tried is to unload the 'fan' and 'thermal' modules and then reload them, but that seems to have no effect.
I am attaching a log from dmesg, after I have hibernated and resumed the system (I probably had also suspended and resumed before hibernating, but the fan problem is just related to hibernate).
If there is any information I can provide to help debug the problem, please let me know. I don't know how many laptop models face this issue, but it really needs to be fixed.

[Terry (wanghhao)]

I encountered this issue with my too. I used AC and the funs didn't work at all. My hard disk has broken.

[Evgeny Kuznetsov (nekr0z)]

I can confirm this on Lenovo N100, and judging by the forums, this is a known Ubuntu issue.

[Peter Rhone (prhone-gmail)]

Confimed here as well: same laptop - same problem. Haven't tried disconnecting the AC power cord yet though, thanks for the tip. It took me a few days to figure out why my computer was just turning itself off without warning - hopefully it isn't permanently damaged. Suspend doesn't work for me either so I guess the ACPI support for our laptop is flaky at best :-(

[Launchpad Janitor (janitor)]

Beginning with the Hardy Heron 8.04 development cycle, all open Ubuntu kernel bugs need to be reported against the "linux" kernel package. We are automatically migrating this bug to the new "linux" package. However, development has already began for the upcoming Intrepid Ibex 8.10 release. It would be helpful if you could test the upcoming release and verify if this is still an issue - http://www.ubuntu.com/testing . If the issue still exists, please update this report by changing the Status of the "linux" task from "Incomplete" to "New". We appreciate your patience and understanding as we make this transition. Thanks!

[ArheoN (arheon)]

I confirm the bug @ Lenovo 3000 N200
running ubuntu 8.10b