tpfanco keeps fan at 0 RPM, after updating kernel and X stack on Ubuntu 14.04

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I have successfully been running tpfanco on Ubuntu 14.04 (Trusty) on my X220 
Tablet for quite some time, using Stephan's patch (from the discussion in issue 
#2).

Yesterday, I decided to update the kernel and X stack using Ubuntu's "LTS 
Enablement Stacks", see https://wiki.ubuntu.com/Kernel/LTSEnablementStack.

In other words, I ran the following command:

  $ sudo apt-get install --install-recommends linux-generic-lts-utopic xserver-xorg-lts-utopic libgl1-mesa-glx-lts-utopic libegl1-mesa-drivers-lts-utopic

Afterwards, I noticed that tpfanco did not work properly anymore. In fact, it's 
somewhat dangerous, since the fan is never turned on and will be stuck on 0 RPM 
when tpfand is running. I didn't notice this until the powerclamp driver 
(http://askubuntu.com/a/482326) kicked in to prevent the CPU from overheating.

I don't nearly have sufficient knowledge to determine what causes the issue, 
and how specific the issue is to my setup. In any case, it does mean that using 
tpfanco could currently be seriously unsafe(!).

In the tpfanco-admin GUI, no temperatures show up anymore, see the attached 
screenshots.

To summarise my setup:
- Ubuntu 14.04, 64bit, updated using LTS Enablement Stack.
- Kernel version 3.16.0-31-generic (after updating using the Enamblement Stack, 
3.13 before updating)
- Intel P-state enabled
- tpfand 0.95.3, patched with Stephan's patch for new thinkpads (from the 
discussion in issue #2)

Original issue reported on code.google.com by [email protected] on 18 Mar 2015 at 12:02

Attachments:

• tpfan-admin_usingManualConfig.png