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Message #149859
[Bug 1514052] Re: erratic fan speed and little control kernel 4.2
Bug report submitted - http://marc.info/?l=linux-
kernel&m=144917448916562&w=2
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https://bugs.launchpad.net/bugs/1514052
Title:
erratic fan speed and little control kernel 4.2
Status in linux package in Ubuntu:
Triaged
Bug description:
After upgrading to Ubuntu 15.10 my CPU fan started speeding and
slowing without good reason even when the PC is idle.
This has been bisected to commit f989e55452c74b4f7b22c889b8ec9f1192aaeec4 :
i8k: Add support for fan labels
This patch adds labels support for fans if SMM function with EAX register
0x03a3 reports it. This information was taken from DOS binary NBSVC.MDM.
Additionally this patch change detection of fan presece. Instead reading fan
status now detection is based on new label SMM function. Dell DOS binary
NBSVC.MDM is doing similar checks, so we should do that too.
This patch also remove I8K_FAN_LEFT and I8K_FAN_RIGHT usage from hwmon driver
part because that names does not make sense anymore. So numeric constants are
used instead. Original /proc/i8k ioctl part was not changed for compatibility
reasons.
Signed-off-by: Pali Rohár <pali.rohar@xxxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
WORKAROUND: Shutdown. After it cools down for a while, turn it on.
Tried intel_pstate but it is not supported for some reason on my
machine ie the following does not work and I am left with driver:
acpi-cpufreq
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=enable"
Could not see ACPI Thermal Zones reported in dmesg
$ dmesg | grep ACPI
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1514052/+attachment/4527212/+files/dmesg
---
ApportVersion: 2.19.1-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: pas 2076 F.... pulseaudio
/dev/snd/controlC1: pas 2076 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 15.10
HibernationDevice: RESUME=UUID=68ce068c-1889-4f00-9b8a-12d7dc64348b
InstallationDate: Installed on 2011-02-22 (1718 days ago)
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
IwConfig:
eth0 no wireless extensions.
lo no wireless extensions.
MachineType: Dell Inc. Inspiron 580
Package: linux (not installed)
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-17-generic root=UUID=bf510382-4d2b-49d6-b9d9-ac6e3f6334eb ro intel_pstate=enable
ProcVersionSignature: Ubuntu 4.2.0-17.21-generic 4.2.3
RelatedPackageVersions:
linux-restricted-modules-4.2.0-17-generic N/A
linux-backports-modules-4.2.0-17-generic N/A
linux-firmware 1.149.1
RfKill:
Tags: wily
Uname: Linux 4.2.0-17-generic x86_64
UpgradeStatus: Upgraded to wily on 2015-11-06 (0 days ago)
UserGroups: adm admin cdrom dialout fuse lpadmin plugdev sambashare vboxusers wireshark
_MarkForUpload: True
dmi.bios.date: 11/13/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 0C2KJT
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA07:bd11/13/2010:svnDellInc.:pnInspiron580:pvr:rvnDellInc.:rn0C2KJT:rvrA00:cvnDellInc.:ct3:cvr:
dmi.product.name: Inspiron 580
dmi.sys.vendor: Dell Inc.
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