Luckily there are workarounds for this issue for both the old situation(1) and systemd(2).
1) In the old situation (Trusty Tahr - upstart) I found the following remedy that works like a charm: Make a file with the following content (just the way I found in on the internet) read further below the quote: bash script: #!/bin/sh # # Reset fan speeds after resume, otherwise they blow at maximum speed # # Used as work-around for ACPI kernel bug 58301 # https://bugzilla.kernel.org/show_bug.cgi?id=58301 # # The idea for this fix was taken from # http://ubuntuforums.org/showthread.php?t=1761370 # # Author: fr...@qnipp.com # # To be made executable (sudo chmod 755 AnyName.sh and then to be saved as /etc/pm/sleep.d/AnyName.sh case "$1" in thaw|resume) for i in /sys/class/thermal/cooling_device* ; do type=`cat $i/type` if [ "$type" = "Fan" ] ; then echo 0 > $i/cur_state fi done ;; esac 2) But things are changed with systemd. After a proces of trial and error I found the following: step one: Create a file with the following content (read further below quote) : bash script: #!/bin/sh # make this file executable (chmod 755 NameFile.sh) # copy this file to folder /lib/systemd/system-sleep/ if [ $1 = post ] && [ $2 = suspend ] then /usr/local/bin/fansystemd.sh fi step two: Then create a file with the following content: bash script: #!/bin/sh # # Reset fan speeds after resume, otherwise they blow at maximum speed # # Used as work-around for ACPI kernel bug 58301 # https://bugzilla.kernel.org/show_bug.cgi?id=58301 # # The idea for this fix was taken from # http://ubuntuforums.org/showthread.php?t=1761370 # # Author: fr...@qnipp.com # # make file exectable (sudo chmod 755 NameFile.sh) # To be saved as /usr/local/bin/ (sudo cp NameFile.sh /usr/local/bin/) # this is like the upstart-script only without the first lines for i in /sys/class/thermal/cooling_device* ; do type=`cat $i/type` if [ "$type" = "Fan" ] ; then echo 0 > $i/cur_state fi done ;; esac Make file exectable (sudo chmod 755 NameFile.sh), save as as /usr/local/bin/NameFile.sh (sudo cp NameFile.sh /usr/local/bin/). This is like the upstart-script only without the first lines. This is 100% effective. ** Bug watch added: Linux Kernel Bug Tracker #58301 http://bugzilla.kernel.org/show_bug.cgi?id=58301 -- 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/1543194 Title: [HP Compaq 6720s] Fan at full speed after suspend Status in linux package in Ubuntu: Incomplete Bug description: I'm running Ubuntu 16.04 Xenial 64 bit on my compaq 7620s. Bug 1245164 came back. After suspension the fan makes a loud noise and it continues to do so. In fact I also noticed it on 15.10. Also in 14.04.3 it was wrong. But I followed some advice on the internet and after that it behaved good. But I can't find a cure for the issue now. Just as I couldn't with 15.10 --- ApportVersion: 2.19.4-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: slmpe 1216 F.... pulseaudio CurrentDesktop: Unity DistroRelease: Ubuntu 16.04 HibernationDevice: RESUME=UUID=c0829020-bf7b-4ef4-a77c-476f90fde613 InstallationDate: Installed on 2016-02-08 (0 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160208) MachineType: Hewlett-Packard HP Compaq 6720s Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-2-generic root=UUID=80d9c9ab-f646-44e0-bb41-c66c93fcb53e ro quiet splash ProcVersionSignature: Ubuntu 4.4.0-2.16-generic 4.4.0 RelatedPackageVersions: linux-restricted-modules-4.4.0-2-generic N/A linux-backports-modules-4.4.0-2-generic N/A linux-firmware 1.155 Tags: xenial Uname: Linux 4.4.0-2-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 11/04/2008 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: 68MDU Ver. F.0D dmi.board.name: 30D8 dmi.board.vendor: Hewlett-Packard dmi.board.version: KBC Version 83.0E dmi.chassis.asset.tag: CNU80831FG dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnHewlett-Packard:bvr68MDUVer.F.0D:bd11/04/2008:svnHewlett-Packard:pnHPCompaq6720s:pvrF.0D:rvnHewlett-Packard:rn30D8:rvrKBCVersion83.0E:cvnHewlett-Packard:ct10:cvr: dmi.product.name: HP Compaq 6720s dmi.product.version: F.0D dmi.sys.vendor: Hewlett-Packard To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1543194/+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
