------- Comment From pschm...@de.ibm.com 2016-03-23 04:57 EDT-------
tested with kernel 4.4.0-15-generic, works fine now, thanks!

root@s3515027:~# cat /etc/os-release
NAME="Ubuntu"
VERSION="16.04 (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/";
SUPPORT_URL="http://help.ubuntu.com/";
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
UBUNTU_CODENAME=xenial

root@s3515027:~# modprobe dasd_diag_mod
root@s3515027:~# chccwdev -d 0.0.2f4f
root@s3515027:~# cd /sys/bus/ccw/devices/0.0.2f4f
root@s3515027:/sys/bus/ccw/devices/0.0.2f4f# echo 1 > use_diag
root@s3515027:~# chccwdev -e 0.0.2f4f
Setting device 0.0.2f4f online
Done
root@s3515027:~# lsmod |grep diag
dasd_diag_mod          20480  2
dasd_mod              135168  7 dasd_eckd_mod,dasd_diag_mod

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https://bugs.launchpad.net/bugs/1553171

Title:
  eckd dasd can not be set online when using "use_diag=1" mode

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