[Bug 1475945] Re: blacklisting i2c_i801 breaks trackpad detection on Acer C710, plus other hardware

[Javier Vilalta]

I have found that iTCO_wdt doesn't work without previously loading i2c-i801 (you can see a pair of references in http://linux-kernel.2935.n7.nabble.com/PATCH-0-5-iTCO-wdt-Add-support-for-Intel-Sunrisepoint-td1160031.html and in https://lkml.org/lkml/2016/9/10/157) As it's blacklisted, it doesn't load even when putting it on /etc/modules.
As stated by OP on launchpad discussion, it seems that the original decission to blacklist i2-i801, as correct as it was in its moment, seems to be creating more problems now for modern systems.

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https://bugs.launchpad.net/bugs/1475945

Title:
  blacklisting i2c_i801 breaks trackpad detection on Acer C710, plus
  other hardware

Status in kmod package in Ubuntu:
  New

Bug description:
  file:
  /etc/modprobe.d/blacklist.conf

  contains the text:
  # causes failure to suspend on HP compaq nc6000 (Ubuntu: #10306)
  blacklist i2c_i801

  note: actually the correct LP id appears to be
  https://bugs.launchpad.net/bugs/16602

  after short discussion at
  https://answers.launchpad.net/ubuntu/+source/kmod/+question/269329 I'm
  raising this as a bug

  as well as preventing trackpad detection in the case of Acer C710,
  there is an older bug open at https://bugs.launchpad.net/bugs/857175.
  Here this same blacklist entry breaks some functionality for a
  Thinkpad T41. In turn, that bug includes a reference to another source
  (http://permalink.gmane.org/gmane.linux.drivers.i2c/9120) where the
  blacklist entry has required support effort.

  lsb_release -rd
  Description:	Ubuntu 15.04
  Release:	15.04

  apt-cache policy kmod
  kmod:
    Installed: 18-3ubuntu1
    Candidate: 18-3ubuntu1
    Version table:
   *** 18-3ubuntu1 0
          500 http://au.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
          100 /var/lib/dpkg/status

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