Red Hat Bugzilla – Bug 235813
CPU Fan stops as kernel starts booting in FC6
Last modified: 2008-08-02 19:40:34 EDT
The CPU fan ( of P3 450 MHz Intel) stops as soon as the kernel starts booting,
and never comes up again.
Version-Release number of selected component (if applicable): FC6 (DVD version)
Does this lead to an actual problem? If the system is running cool enough and
has fan throttling abilities enabled in the bios, this is intentional. If its
leading to issues, please try to reproduce with the latest FC6 kernel. If its
still causing problems with that kernel, we may need to do some additional
I have experianced this with my Compaq nx6325 laptop. Even with the BIOS set to
run the fan when on A/C, as soon as Linux begins to boot the fan will spin down
to practically nothing. I think it's an issue with the ACPI mechanism. I'm
running Ksensors and have alarms set on HD temp to alert me to when the temp
rises. Ignoring the alarm will eventually trigger the BIOS to shut down the
laptop. I'm guessing this is a safety mechanism to prevent a meltdown to the
CPU. If you power the laptop back on immediatly after an overheat condition shut
own the fan comes on at full speed until Linux begins to boot and then the fan
RPM's drop back to hardly anything. The older FC6 kernels would shut the fan
completely off. The newer versions seem to just throttle it down to a much
slower RPM. I've read a few sites where the authors have accused HP of having a
bug in their BIOS code etc however, I'm not familiar enough with the underlying
ACPI structure to provide any input other than observations at this point.
(2.6.20-1.2944.fc6 #1 SMP x86_64 x86_64 x86_64)
Any better with the latest Fedora 7 kernel?
And yeah, HP is somewhat notorious for having bios issues...
No activity in 7 months, closing INSUFFICIENT_DATA.