Dell Latitude E5520

[Vojtěch Látal]

After the upgrade from 13.10 to 14.04 fan on my Dell Latitude E5520 is working weird. It works in cycles as follows:
100% for about 0.1s
0% 0.1s
cca 60% for 2 - x seconds, depending on cpu temperature I think.

Before the upgrade fan speed has been set depending on cpu temperature SMOOTHLY with some hysteresis.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-29-generic 3.13.0-29.53
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
Uname: Linux 3.13.0-29-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: latal 3590 F.... pulseaudio
 /dev/snd/pcmC0D0p: latal 3590 F...m pulseaudio
CurrentDesktop: Unity
Date: Sat Jun 7 17:54:29 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2012-07-10 (696 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MachineType: Dell Inc. Latitude E5520
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-29-generic root=UUID=83b4c35b-1649-4b2c-9d62-5c56bdcaa949 ro quiet splash intel_pstate=enable vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-29-generic N/A
 linux-backports-modules-3.13.0-29-generic N/A
 linux-firmware 1.127.2
SourcePackage: linux
UpgradeStatus: Upgraded to trusty on 2014-05-09 (29 days ago)
dmi.bios.date: 11/30/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A05
dmi.board.name: 03PH4G
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA05:bd11/30/2011:svnDellInc.:pnLatitudeE5520:pvr01:rvnDellInc.:rn03PH4G:rvrA01:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E5520
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Vojtěch Látal (vojtik)]

I have updated BIOS, unfortunately it changed nothing neither on 3.15rc8 nor on 3.13.0-29-generic.

$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
A14
12/26/2013

I'm not sure if I get you right - do you want me to fill another bug report because of BIOS update?

[penalvch (penalvch)]

Vojtěch Látal, the next step is to fully commit bisect the kernel in order to identify the offending commit. Could you please do this following https://wiki.ubuntu.com/Kernel/KernelBisection ?

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]