Power button stops working on Xubuntu 18.10

[heikomat]

After a fresh install of Xubuntu 18.10 with all updates, pressing the power-button brings up the logout/shutdown/reboot menu (as is configured by default in the Power Manager settings)

After installing the current (4.19) cx2072x-kernel from this repo using the install-script, the power-button no longer works. Instead of bringing up the logout/shutdown/reboot menu, nothing happens.

The bug is most likely in one of these places:

• the cx2072x-fixes applied to the kernel-variant installed by the install-script
• the configuration with wich the cx2072x-kernel is built
• the 4.19-kernel itself