After upgrading from lubuntu 13.10 to 14.04 the fan of my laptop seems to run much more often than in 13.10. When it runs, it doesn't run continously but starts and stops every second.

fwts fan results in

Results generated by fwts: Version V14.03.01 (2014-03-27 02:14:17).

Some of this work - Copyright (c) 1999 - 2014, Intel Corp. All rights reserved.
Some of this work - Copyright (c) 2010 - 2014, Canonical.

This test run on 12/05/14 at 21:40:13 on host Linux einstein 3.13.0-24-generic
#47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64.

Command: "fwts fan".
Running tests: fan.

fan: Simple fan tests.
--------------------------------------------------------------------------------
Test 1 of 2: Test fan status.
Test how many fans there are in the system. Check for the current status of the
fan(s).
PASSED: Test 1, Fan cooling_device0 of type Processor has max cooling state 10
and current cooling state 0.
PASSED: Test 1, Fan cooling_device1 of type Processor has max cooling state 10
and current cooling state 0.
PASSED: Test 1, Fan cooling_device2 of type LCD has max cooling state 15 and
current cooling state 10.

Test 2 of 2: Load system, check CPU fan status.
Test how many fans there are in the system. Check for the current status of the
fan(s).
Loading CPUs for 20 seconds to try and get fan speeds to change.
Fan cooling_device0 current state did not change from value 0 while CPUs were
busy.
Fan cooling_device1 current state did not change from value 0 while CPUs were
busy.

ADVICE: Did not detect any change in the CPU related thermal cooling device
states. It could be that the devices are returning static information back to
the driver and/or the fan speed is automatically being controlled by firmware
using System Management Mode in which case the kernel interfaces being examined
may not work anyway.


================================================================================
3 passed, 0 failed, 0 warning, 0 aborted, 0 skipped, 0 info only.
================================================================================


3 passed, 0 failed, 0 warning, 0 aborted, 0 skipped, 0 info only.

Test Failure Summary
================================================================================

Critical failures: NONE

High failures: NONE

Medium failures: NONE

Low failures: NONE

Other failures: NONE

Test           |Pass |Fail |Abort|Warn |Skip |Info |
---------------+-----+-----+-----+-----+-----+-----+
fan            |    3|     |     |     |     |     |
---------------+-----+-----+-----+-----+-----+-----+
Total:         |    3|    0|    0|    0|    0|    0|
---------------+-----+-----+-----+-----+-----+-----+

Here is the output of lsmod

lsmod
Module                  Size  Used by
i8k                    14421  0 
zram                   18478  2 
dm_crypt               23177  0 
gpio_ich               13476  0 
dell_wmi               12761  0 
sparse_keymap          13948  1 dell_wmi
snd_hda_codec_hdmi     46207  1 
snd_hda_codec_idt      54645  1 
rfcomm                 69160  0 
arc4                   12608  2 
dell_laptop            18168  0 
bnep                   19624  2 
dcdbas                 14928  1 dell_laptop
bluetooth             395423  10 bnep,rfcomm
iwldvm                232285  0 
mac80211              626511  1 iwldvm
snd_hda_intel          52355  3 
snd_hda_codec         192906  3 snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel
snd_hwdep              13602  1 snd_hda_codec
snd_pcm               102099  3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
snd_page_alloc         18710  2 snd_pcm,snd_hda_intel
snd_seq_midi           13324  0 
snd_seq_midi_event     14899  1 snd_seq_midi
snd_rawmidi            30144  1 snd_seq_midi
coretemp               13435  0 
kvm_intel             143060  0 
kvm                   451511  1 kvm_intel
snd_seq                61560  2 snd_seq_midi_event,snd_seq_midi
joydev                 17381  0 
serio_raw              13462  0 
iwlwifi               169932  1 iwldvm
pcmcia                 62299  0 
snd_seq_device         14497  3 snd_seq,snd_rawmidi,snd_seq_midi
snd_timer              29482  2 snd_pcm,snd_seq
lpc_ich                21080  0 
cfg80211              484040  3 iwlwifi,mac80211,iwldvm
yenta_socket           41027  0 
pcmcia_rsrc            18407  1 yenta_socket
pcmcia_core            23592  3 pcmcia,pcmcia_rsrc,yenta_socket
binfmt_misc            17468  1 
snd                    69238  17 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_codec_idt,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec,snd_hda_intel,snd_seq_device,snd_seq_midi
soundcore              12680  1 snd
parport_pc             32701  0 
mac_hid                13205  0 
ppdev                  17671  0 
lp                     17759  0 
parport                42348  3 lp,ppdev,parport_pc
firewire_ohci          40409  0 
psmouse               102222  0 
sdhci_pci              23172  0 
sdhci                  43015  1 sdhci_pci
firewire_core          68769  1 firewire_ohci
crc_itu_t              12707  1 firewire_core
ahci                   25819  2 
libahci                32168  1 ahci
i915                  783485  2 
wmi                    19177  1 dell_wmi
i2c_algo_bit           13413  1 i915
drm_kms_helper         52758  1 i915
e1000e                254433  0 
drm                   302817  3 i915,drm_kms_helper
ptp                    18933  1 e1000e
pps_core               19382  1 ptp
video                  19476  1 i915

I tried one answer to the similar question: loud fan on Ubuntu 14.04 and created a /etc/i8kmon.conf like the following:

# Run as daemon, override with --daemon option
set config(daemon) 1

# Automatic fan control, override with --auto option
set config(auto) 1

# Status check timeout (seconds), override with --timeout option  
set config(timeout) 2

# Report status on stdout, override with --verbose option
set config(verbose) 1

# Temperature thresholds: {fan_speeds low_ac high_ac low_batt high_batt}
set config(0) {{0 0} -1 55 -1 55}
set config(1) {{0 1} 50 60 55 65}
set config(2) {{1 1} 55 80 60 85}
set config(3) {{2 2} 70 128 75 128}

With this setup the fan goes on even if the temperature is below 50 degree celsius (I don't see a pattern). However I get the impression that the CPU got's hotter in average than without this file.

What changes from 13.10 to 14.04 may be responsible for this?

If this is a bug, for which package I should report the bug?