Comment 1 for bug 115301

I can confirm that this is also an issue in the Lenovo 3000 N100 with the (I think) Intel duo T2300 and the latest Feisty upgrades. I can't confirm whether this was present in Dapper (new laptop) but it has been occurring from the end of March - it's not related to a recent upgrade.

Hibernate works just fine, but upon resume the fan does not work and the CPU overheats regularly (causing the laptop to shut down).

Normal operating temperature BEFORE hibernation tends to be about 48C, and when I jack up the CPU to 100% and watch some flash videos that rises to 61C. The fan kicks in above 50C and the temperature does not rise above 61C (in my brief tests). After turning down CPU back to ~0%, temperature returns to 48C within 20 seconds.

AFTER hibernate, jacking CPU usage up to 100% and watching flash videos rapidly sent the temperature above 70C, and no fan. The temperature continued to rise about 1 degree every few seconds, so I stopped the test (otherwise it would have shut down). The temperature has remained constant at 76C for about 10 minutes now since conducting the test.

The following outputs are taken after hibernation, as is the lsmod attachment (note that the fan and thermal modules are loaded, even after resume from hibernation).

[robert@mujuno: ~] cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 14
model name : Genuine Intel(R) CPU T2300 @ 1.66GHz
[snip]

[robert@mujuno: ~] uname -a
Linux mujuno 2.6.20-15-386 #2 Sun Apr 15 07:34:00 UTC 2007 i686 GNU/Linux

[robert@mujuno: ~] cat /proc/acpi/thermal_zone/TZ00/*
cooling mode: active
<polling disabled>
state: ok
temperature: 76 C
critical (S5): 102 C
passive: 87 C: tc1=0 tc2=4 tsp=4 devices=0xde07c6bc 0xde07c6a8