[HP Compaq 6720s] Fan at full speed after suspend

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This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1543194

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This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

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Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.5 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.5-rc3-wily/

kernel-fixed-upstream

pieter k, the next step is to fully reverse commit bisect from kernel 4.4 to 4.5-rc3 in order to identify the last bad commit, followed immediately by the first good one. Once this good commit has been identified, it may be reviewed for backporting. Could you please do this following https://wiki.ubuntu.com/Kernel/KernelBisection#How_do_I_reverse_bisect_the_upstream_kernel.3F ?

Please note, finding adjacent kernel versions is not fully commit bisecting.

After the fix commit (not kernel version) has been identified, then please mark this report Status Confirmed.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

I am an enthusiastic linux user (mainly (k)ubuntu, but this "bisecting" is above my league. I'm sorry to say. I find the:

linux-headers-4.5.0-040500rc3_4.5.0-040500rc3.201602071930_all.deb
linux-headers-4.5.0-040500rc3-generic_4.5.0-040500rc3.201602071930_amd64.deb
linux-image-4.5.0-040500rc3-generic_4.5.0-040500rc3.201602071930_amd64.deb

to work properly and the 4.4.0(-2 and -4) to not work properly.
I hope I have been of help anyway.

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: <email address hidden>
#
# 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: <email address hidden>
#
# 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.