bequimão Desktop effect 'Present windows on all desktops' under Systemsettings -> Desktop behaviour -> Screen edges -> Active screen edges is active. Desktop theme is Breeze dark, no virtual desktops, AMD/ATI Radeon HD 7550M/7570M/7650M with radeon driver. There is no reaction to a mouse move to the upper left corner. Regards, Bequimão
demm Just in case it is related to a similar mouse/hover bug, what plasma-framework version do you have? pacman -Q plasma-framework if you have version -2 make sure to reboot or restart plasma after updating.
bequimão It works in a newly created test user. I removed all ~/.config/plasma*rc and switched the effect on and off without any change in my first user. Still no clue what is the cause.
demm kwinrc might be broken for your user. Since it works for a new user you will have to try and find what setting in your ~/.config is causing this. Might be easiest to rename that dir and let KDE create a new one, then move the files back one by one until you note the faulty one.