Notebook CPU fan stays off after resuming from hibernate
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Incomplete
|
Undecided
|
Unassigned | ||
linux-source-2.6.20 (Ubuntu) |
Won't Fix
|
Undecided
|
Unassigned |
Bug Description
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.
I encountered this issue with my too. I used AC and the funs didn't work at all. My hard disk has broken.