keyboard state scrambled after unlock

[Andrew Kay]

after locking the screen with ctl-alt-l the keyboard state changes to something strange.

I usually leave the keypad in the non-num-lock mode, so that eg "2" maps to up-arrow (otherwise my keyboard has no dedicated arrow keys, so this is important.)

During lock (eg at the password screen) the num-lock seems to be engaged automatically, and I think 2 maps to 2 again (which isn't a problem.)

However, after unlock "2" maps to something odd, neither "2" nor "up". I have to press num-lock TWICE to get back to my preferred no-num-lock state. This is wrong.

The problem is similar with all the keypad keys, "2" is just an example.

The arrow mode is something built-in to my Quick-fire cooler master cm-storm keyboard, it's not something I hacked myself.
This behaviour appeared after I performed LTS upgrade from Xubuntu 16.04 to Xubuntu 18.04

I'm guessing this is the right package to report, as xscreensaver is not installed, and flock tries first xscreensaver-command and then "light-locker-command --lock"

Description: Ubuntu 18.04.1 LTS
Release: 18.04
light-locker:
  Installed: 1.8.0-1ubuntu1
  Candidate: 1.8.0-1ubuntu1
  Version table:
 *** 1.8.0-1ubuntu1 500
        500 http://gb.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: light-locker 1.8.0-1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-45.48-generic 4.15.18
Uname: Linux 4.15.0-45-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed Feb 13 09:03:48 2019
InstallationDate: Installed on 2016-09-28 (867 days ago)
InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: light-locker
UpgradeStatus: Upgraded to bionic on 2019-01-14 (30 days ago)

[Theo Linkspfeifer (lastonestanding)]

Light-locker uses lightdm-gtk-greeter to display the unlock screen. The greeter runs "numlockx" on initialization.

Does temporary removing the following file resolve the issue?

/usr/share/lightdm/lightdm.conf.d/50-xubuntu-numlock.conf

[Andrew Kay (music1)]

Yes, exactly it. Remove the file, reboot, problem goes away. Replace the file, reboot, problem comes back.

Thanks (and that's my workaround for now.)