This bug is related to Asus 1025C laptop.
Steps to reproduce:
1) Boot into Ubuntu
2) run pm-suspend
3) Wake up the laptop
After a few seconds the CPU fan spins up to max speed and it doesn't slow down until reboot/poweroff.
Hibernation can also fix this, so, fan runs at normal speed.
It is not a PWM fan, so, I guess, I can't control it via /sys.
Output of "sensors" before suspend:
acpitz-virtual-0
Adapter: Virtual device
temp1: +55.0°C (crit = +255.0°C)
after:
acpitz-virtual-0
Adapter: Virtual device
temp1: +0.0°C (crit = +255.0°C)
I've had a Linux Mint 17 before Ubuntu 15.10. No issues were in Mint. Before Mint, I've used a Kubuntu 14.04, 14.10, no issues either.
I've tried to compile old versions of linux kernel (from the official git repo) and I noticed, that 3.16 kernel was the latest, where fan works properly. 3.17-rc1 breaks it.
According to git commit history, 3.17 kernel have many commits related to ACPI/PM fixes.
My guess is that kernel doesn't restore thermal sensor device from sleep properly since 3.17.
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-34-generic 4.2.0-34.39
ProcVersionSignature: Ubuntu 4.2.0-34.39-generic 4.2.8-ckt4
Uname: Linux 4.2.0-34-generic i686
ApportVersion: 2.19.1-0ubuntu5
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: raxp 1809 F.... pulseaudio
CurrentDesktop: MATE
Date: Mon Apr 4 17:17:13 2016
HibernationDevice: RESUME=UUID=31cbf4f8-c9b4-4025-b1fd-d5f474861585
InstallationDate: Installed on 2016-03-16 (19 days ago)
InstallationMedia: Ubuntu-MATE 15.10 "Wily Werewolf" - Release i386 (20151021)
MachineType: ASUSTeK COMPUTER INC. 1025C
ProcFB: 0 psbdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-34-generic root=UUID=98d65d26-361a-4e60-80e4-7b63d31d1ec6 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.2.0-34-generic N/A
linux-backports-modules-4.2.0-34-generic N/A
linux-firmware 1.149.3
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/16/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1025C.1001
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: 1025C
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: x.xx
dmi.chassis.asset.tag: 0x00000000
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: x.x
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1025C.1001:bd04/16/2012:svnASUSTeKCOMPUTERINC.:pn1025C:pvrx.x:rvnASUSTeKCOMPUTERINC.:rn1025C:rvrx.xx:cvnASUSTeKCOMPUTERINC.:ct10:cvrx.x:
dmi.product.name: 1025C
dmi.product.version: x.x
dmi.sys.vendor: ASUSTeK COMPUTER INC.
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