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 Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1543194 Title: [HP Compaq 6720s] Fan at full speed after suspend To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1543194/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
