Created attachment 106969 [details] Lock screen with a dark background When using a dark colour for the lock screen background (Plain Colour mode), the foreground colours appear dark and are not easily visible. This is not the case with the Breeze SDDM theme, which shows light (white) foreground colours against a dark background colour (although I have a feeling that it will use light colours against a light background as well!). See the attached screenshot.
I've just noticed that this happens with the Fedora Twenty Six desktop theme, not with Breeze. Perhaps this should be reported to Red Hat; I'm sorry for creating the confusion. I don't know where the system's desktop themes are stored, or I could attach a copy of the Fedora Twenty Six theme, if these needs any further investigation.
Please report to Fedora.
(In reply to Martin Flöser from comment #2) > Please report to Fedora. https://bugzilla.redhat.com/show_bug.cgi?id=1476602