Public bug reported:

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

** Affects: linux (Ubuntu)
     Importance: High
     Assignee: Seth Forshee (sforshee)
         Status: Confirmed

** Changed in: linux (Ubuntu)
       Status: New => Confirmed

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

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

Title:
  linux 5.2.0-8.9 disabled backlight on s390x.

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