https://bugzilla.kernel.org/show_bug.cgi?id=56591
Summary: HP/Compaq NC6000 fan speed regression on 3.7+
Product: ACPI
Version: 2.5
Kernel Version: 3.7+
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Thermal
AssignedTo: acpi_power-ther...@kernel-bugs.osdl.org
ReportedBy: syrj...@sci.fi
CC: rui.zh...@intel.com
Regression: Yes
Created an attachment (id=98531)
--> (https://bugzilla.kernel.org/attachment.cgi?id=98531)
Logs and dumps from 3.7.10 and 3.9-rc6 kernels
There's a regression in thermal subsystem in 3.7 kernel, which results in fan
speed staying after during resume.
Other people have seen the problem, although it may be that the exact nature of
the bug is a bit different between different machines.
Here are the mailing list references:
https://lkml.org/lkml/2013/3/2/171
https://lkml.org/lkml/2013/4/13/142
For me on 3.7.10 the symptoms of the bug depend on whether I resume the laptop
when it's totally cooled down, or still warm. When the bug occurs, the reported
temperature somehow goes out of sync with the trip points, and the cooling
device cur_state doesn't always match the fan speed.
On 3.9-rc6, there's actually another regression, which causes the fan speed to
misbehave already without any suspend/resume cycles. What happens is that the
fan speeds up when the temperature rises, but when the temperature comes back
down, the fan doesn't slow down. When cooling down, the temperature of the trip
points does seem to change due to hysteresis, so some activity happens when the
trip points are reached, but somehow the cooling devices don't get turned off.
The cooling device cur_state accurately reflects the fan speed in this case.
I also tested
git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux.git thermal
but it appears to behave exactly like 3.9-rc6.
I've attached a tarball with logs from both bug scenarios on a 3.7.10 kernel.
I've included logs from a 3.9-rc6 kernel as well, but as stated you don't
actually need to suspend/resume to trigger the misbehavior on 3.9-rc6. The
"desc.txt" files inside the tarball describe the steps I took when I collected
the logs. The tarball also contains acpidump output.
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