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A voluenteer tests the patched kernel (from
http://koji.fedoraproject.org/koji/taskinfo?taskID=6430928) with patch
(from  http://www.spinics.net/lists/linux-bluetooth/msg41904.html). And
it seems that kernel works with trackpad without crash.

https://bugzilla.redhat.com/show_bug.cgi?id=1027465#c22
https://bugzilla.redhat.com/show_bug.cgi?id=1027465#c23
https://bugzilla.redhat.com/show_bug.cgi?id=1027465#c24

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https://bugs.launchpad.net/bugs/1266153

Title:
  Apple Wireless Trackpad causes kernel (3.12.x/3.13.rcx) crash

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Apple Trackpad indeed crashes kernel 3.12.0-031200-generic on SAUCY.
  But 3.11.0-12/3.11.0-14 seem to be good.

  I have tried TRUSTY alpha1, either 3.12.0-6/3.12.0-7, both of them
  crashes with trackpad.

  AND, I also test Apple MagicMouse, none of mentioned kernel crashes
  with it.......

  The following threads have resolution for SAUCY with 3.11 kernels, BUT
  no for SAUTY with 3.12 nor TRUSTY with 3.12 (Haven't tried 3.13-rcx)

  Apple Trackpad indeed crashes kernel 3.12.0-031200-generic on SAUCY
  (and TRUSTY with 3.12). But 3.11.0-12/3.11.0-14 seem to be good.

  I have tried TRUSTY alpha1, either 3.12.0-6/3.12.0-7, both of them
  crashes with trackpad.

  AND, I also test Apple MagicMouse, none of mentioned kernel crashes
  with either SAUCY nor TRUSTY.......

  FYI:

  Apple Wireless Trackpad causes kernel oops
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1218004

  kernel oops in free_task
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1214931;

  Apple Wireless Trackpad "magicmouse" crashes kernel on multitouch
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1248287


  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  It seems that problems have been identified here are the post I found:

  Bug 1027465 - Apple bluetooth magic trackpad crashes system
  https://bugzilla.redhat.com/show_bug.cgi?id=1027465
  ===============================================================
  Michele Baldessari 2013-12-01 06:42:58 EST
  Seems the chromium guys had a similar issue:
  http://code.google.com/p/chromium/issues/detail?id=242344

  They papered over the issue with:
  http://www.spinics.net/lists/linux-bluetooth/msg15564.html
  ===============================================================
  Michele Baldessari 2014-01-07 06:27:56 EST
  Thanks. Initial work to fix this is here:
  http://www.spinics.net/lists/linux-bluetooth/msg41904.html

  It has not been included in any tree yet as the patch is still under discussion
  ===============================================================
  Clarke Wixon 2014-01-07 13:48:15 EST
  Michele, going back to your 2014-01-03 inquiry - my vague recollection adds to the apparent consensus that this bug started around 3.11.x (though I don't remember any issues with 3.9).

  I think I started seeing it around October on Fedora 19, but at the
  time I was too busy with other matters to do any troubleshooting, so I
  just substituted my USB keyboard and trackball.

  Bluetooth input on 3.11/3.12 has been ALL KINDS of troublesome for me.  The Apple keyboard also has been problematic (bug 1039738).  I'm hoping the cleanup here will help on that as well.(https://bugzilla.redhat.com/show_bug.cgi?id=1039738)
  ===============================================================

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