I can't test this 3.13 kernel, as it has multiple other problems.

What I was talking about was the 4.4 Xenial kernel compiled with the
Trusty config / compiler, so my modules will build against:

Makefile:702: Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-
protector-strong not supported by compiler.

So on Trusty with HWE Xenial I get:

$ grep CONFIG_CC_STACKPROTECTOR_STRONG /boot/config-4.4.0-111-generic 

while on Xenial I have

$ grep CONFIG_CC_STACKPROTECTOR_STRONG /boot/config-4.4.0-112-generic

Sorry for not being explicit enough.

BTW: I manually compiled the Ubuntu kernel source with my attached
patch, the config from /boot as .config and a make oldconfig etc. and it
worked as expected.

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  Support rfkill-any led trigger for Fujitsu u727

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  In Progress
Status in linux source package in Xenial:
  In Progress

Bug description:
  I got new HW from our supplier, which is the Fujitsu u7x7 laptop series based 
on Skylake hardware.
  It has a single rfkill button and a single LED for wlan and bluetooth. Both 
device driver currently provide a single rfkill trigger, so the led could just 
be assigned to one. As a result the upstream kernel got a new "rfkill-any" led 
trigger to correctly handle the led with multiple rfkill devices. That was 
added by one of the fujitsu-laptop maintainers and the driver sets it as the 
default trigger.

  commit 9b8e34e211b15af429b72388a8f2b3b1823d172e
  Author: Michał Kępień <ker...@kempniu.pl>
  Date:   Fri Jan 6 07:07:47 2017 +0100

      rfkill: Add rfkill-any LED trigger

  Normally I would simply patch the affected modules using DKMS, like the 
i915_bpo driver, fujitsu-laptop and snd_hda_codec_realtek to support the HW 
without messing with the kernel packages.
  I'm currently waiting for some reviews, like 

  But the rfkill support is compiled in, so I can't patch it using DKMS.

  So my first proposed fix would be to include a backport of this patch.
  Alternatively rfkill can be compiled as a module, so I can patch it
  and provide an updated module.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-4.4.0-111-generic 4.4.0-111.134~14.04.1
  ProcVersionSignature: Ubuntu 4.4.0-111.134~14.04.1-generic 4.4.98
  Uname: Linux 4.4.0-111-generic i686
  ApportVersion: 2.14.1-0ubuntu3.27
  Architecture: i386
  Date: Wed Jan 24 10:48:28 2018
  SourcePackage: linux-lts-xenial
  UpgradeStatus: No upgrade log present (probably fresh install)

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