Since the latest update to 5.12 of KDE Plasma my system does not show the lock screen correctly both when manually locking or on resume from hibernate. The lock screen works in as much as I can type my p/w and unlock but nothing is really visible apart from the clock and a very dim place where I can see the asterisks when I type my p/w. This did not happen with the beta of Plasma but only since the update to 5.12. I have tried re-configuring the lock screen in System Settings but nothing happens to change the appearance, in fact I’m not sure that option is working at all since changing to Image does not allow setting of the image or setting it to plain colour does not allow selection of the colour. Plus it looks as though it should display a preview but there is nothing. I am using AMD Caicos graphics with the free drivers.
Anyone any ideas please?