Yes, I was talking to xnox a while back and he has in mind some changes
to fix the testing. I'll check in with him about the status of those,
but the issue is the testing and not ddcci-driver-linux.

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https://bugs.launchpad.net/bugs/1837073

Title:
  linux 5.2.0-8.9 disabled backlight on s390x.

Status in ddcci-driver-linux package in Ubuntu:
  Fix Released
Status in linux package in Ubuntu:
  Invalid

Bug description:
  Looks like ddcci-driver-linux started to fail on s390x with the switch
  from kernel 5.0.0-21-generic to 5.2.0-8-generic

  http://autopkgtest.ubuntu.com/packages/d/ddcci-driver-linux/eoan/s390x


  According to changelog and diff:
      - [Config] CONFIG_BACKLIGHT_CLASS_DEVICE=n on s390x

  from Seth Forshee.

  According to the build log of ddci backlight

  rm: cannot remove '.tmp_versions/ddcci-backlight.mod': No such file or 
directory
  Makefile:227: ================= WARNING ================
  Makefile:228: 'SUBDIRS' will be removed after Linux 5.3
  Makefile:229: Please use 'M=' or 'KBUILD_EXTMOD' instead
  Makefile:230: ==========================================
  Makefile:227: ================= WARNING ================
  Makefile:228: 'SUBDIRS' will be removed after Linux 5.3
  Makefile:229: Please use 'M=' or 'KBUILD_EXTMOD' instead
  Makefile:230: ==========================================
  ERROR: "devm_backlight_device_register" 
[/var/lib/dkms/ddcci/0.3.2/build/ddcci-backlight/ddcci-backlight.ko] undefined!
  make[3]: *** [scripts/Makefile.modpost:91: __modpost] Error 1
  make[2]: *** [Makefile:1628: modules] Error 2
  make[1]: *** [Makefile:37: ddcci-backlight.ko] Error 2

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