OK, sorry, but it seems that I was wrong. The old behaviour is back, as soon as I use the laptop on battery. Before it was connected to AC power. That seems to be one piece of the problem. Will try to gather more info, soon.
acpi -V output: Battery 0: Discharging, 84%, 01:03:32 remaining Battery 0: design capacity 3692 mAh, last full capacity 3692 mAh = 100% Adapter 0: off-line Thermal 0: ok, 26.9 degrees C Thermal 0: trip point 0 switches to mode critical at temperature 108.0 degrees C Thermal 0: trip point 1 switches to mode passive at temperature 55.0 degrees C Thermal 1: active, 75.0 degrees C Thermal 1: trip point 0 switches to mode critical at temperature 108.0 degrees C Thermal 1: trip point 1 switches to mode passive at temperature 100.0 degrees C Thermal 1: trip point 2 switches to mode active at temperature 92.0 degrees C Thermal 1: trip point 3 switches to mode active at temperature 84.0 degrees C Thermal 1: trip point 4 switches to mode active at temperature 69.0 degrees C Cooling 0: LCD 0 of 24 Cooling 1: Processor 0 of 3 Cooling 2: Processor 0 of 3 Cooling 3: Processor 0 of 3 Cooling 4: Processor 0 of 3 Cooling 5: Fan 0 of 1 Cooling 6: Fan 0 of 1 Cooling 7: Fan 0 of 1 Cooling 8: Fan 0 of 1 Cooling 9: Fan 0 of 1 It seems that it somehow waits for the CPU tpo reach ~80°C, with the fan completely OFF. Then it turns the fan on at 100% speed. And that repeats itself every few minutes, depending on load, of course. BTW, I am running Debian, but this seems to be a Kernel bug anyway. I don't have much time ATM, but will probably file an upstream bug, as soon as I have the time and the necessary info. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1315836 Title: [HP 625 Notebook PC] Fan speed control inactive after suspend to ram and sometimes on reboot Status in “linux” package in Ubuntu: Expired Bug description: After resuming from RAM and sometimes after rebooting, fan control appears to be inactive, resulting in no fan activity at all until at 85°C the fan kicks in at full speed for a short time, only to cease all activity again until the temperature reaches 85°C again. This started occurring after upgrading from Ubuntu 13.10 to 14.04 LTS. Identical behaviour on kernel v3.13.9-trusty. I have regrettably already removed older kernel versions, so I am not able to verify that the problem does not occur with them. I am currently partially circumventing the problem by having */2 * * * * echo 1 | tee /sys/class/thermal/cooling_device[0-4]/cur_state >/dev/null 2>&1 added to crontab -e. May be related to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1312860 ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-24-generic 3.13.0-24.46 ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic i686 ApportVersion: 2.14.1-0ubuntu3 Architecture: i386 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: josias 3291 F.... pulseaudio /dev/snd/controlC0: josias 3291 F.... pulseaudio CurrentDesktop: Unity Date: Sun May 4 11:51:03 2014 HibernationDevice: RESUME=UUID=e922940f-3aae-4de7-9479-05b0092ddd04 InstallationDate: Installed on 2011-06-16 (1052 days ago) InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1) MachineType: Hewlett-Packard HP 625 ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=a6a391c7-e65c-4c35-97dc-6d5d3049a09e ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.13.0-24-generic N/A linux-backports-modules-3.13.0-24-generic N/A linux-firmware 1.127.1 SourcePackage: linux UpgradeStatus: Upgraded to trusty on 2014-04-23 (11 days ago) dmi.bios.date: 12/07/2010 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: 68DVA Ver. F.06 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: 1475 dmi.board.vendor: Hewlett-Packard dmi.board.version: KBC Version 72.0E dmi.chassis.asset.tag: CNU1060T5H dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnHewlett-Packard:bvr68DVAVer.F.06:bd12/07/2010:svnHewlett-Packard:pnHP625:pvr:rvnHewlett-Packard:rn1475:rvrKBCVersion72.0E:cvnHewlett-Packard:ct10:cvr: dmi.product.name: HP 625 dmi.sys.vendor: Hewlett-Packard To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1315836/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp