It appears that if the laptop is hot and so the fan is running when the
kernel takes control, it's able to control the fan, but if the fan is
not running when the kernel takes over, it never runs, the machine
overheats, and shuts down.
Here's the /proc/acpi diff between when there is a fan and there is no fan.
Please let me know if additional information would be helpful
diff -ruN fan/acpi/processor/CPU0/power nofan/acpi/processor/CPU0/power
--- fan/acpi/processor/CPU0/power 2007-09-18 16:41:08.000000000 -0400
+++ nofan/acpi/processor/CPU0/power 2007-09-18 16:08:24.000000000 -0400
@@ -1,7 +1,7 @@
active state: C2
max_cstate: C8
-bus master activity: ffffffff
+bus master activity: ffc0ffff
maximum allowed latency: 8000 usec
states:
- C1: type[C1] promotion[C2] demotion[--] latency[000]
usage[00001660] duration[00000000000000000000]
- *C2: type[C2] promotion[--] demotion[C1] latency[010]
usage[00044141] duration[00000000000404148212]
+ C1: type[C1] promotion[C2] demotion[--] latency[000]
usage[00007420] duration[00000000000000000000]
+ *C2: type[C2] promotion[--] demotion[C1] latency[010]
usage[00561247] duration[00000000006395914844]
** Changed in: linux-source-2.6.22 (Ubuntu)
Status: Incomplete => Triaged
--
CPU fan no longer runs after upgrade to Gutsy
https://bugs.launchpad.net/bugs/127772
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