On 5/27, I updated my fedora 25 system (4.10.17-200.fc25.x86_64). Among items updated were kf5-frameworkintegration kf5-frameworkintegration-libs kf5-kdeclarative kf5-kwayland kf5-plasma Before the update, the level was 5.27; afterward 5.34. After updating, "focus follows mouse" stopped working. The window that was supposed to have the focus still has the focus, but the focus appears to be in the wrong place on that window. Example: open firefox and go to http://start.duckduckgo.com Focus is expected to be in the search window. However, when one starts typing, instead of the characters being placed into the search window, a drop-down list appears. Or, open an xfce4 window. One expects to be on the command line. However, once again, a drop-down window appears, and the terminal window expands to include the menu bar. When one clicks inside the window, it removes the menu bar, and the window relocates slightly upward. At that point, one can type the commands.
The reason I specified five packages is that they were the five packages common to the upgrade on 5/27 and the downgrade today when I specified: sudo dnf downgrade kf5-plasma --allowerasing After the downgrade, focus is working again. So, the problem may lie in the changes made to one or more of the five listed packages.
On X or wayland?
Good question. Is there a command-line command that I can use to determine it? When I installed fedora 25, I downloaded the KDE spin iso file and used it to install on my system. I haven't changed from whatever it has as a default.
ps -ef output included a line containing /usr/libexec/Xorg /var/log/messages included lines for starting and stopping Xorg: May 31 10:44:47 sparky systemd: Started ABRT Xorg log watcher.
Another observation: In xfce4-terminal, the blinking cursor has become erratic in timing. If I start Konsole, the blinking cursor seems to blink normally.
Please report to your distribution. It's not possible that only those five packages where updated, it should have been around 70. This means there is a mix of frameworks in different version which is not supported and not tested.
Sorry if I was not clear. There were about 70 updates when those five were updated. When I downgraded again, I did not list all 70. All I listed was one, and it downgraded about 30 or 40 based on dependencies. The five I listed were the ones common to the list of downgraded packages and upgraded packages. I listed them o nly as a starting point. Sorry for the confusion. I don't think this is a Fedora problem. If you like, I can look in the log to see what the 70 or so packages were that were in the upgrade that broke "focus follows mouse". It continues, and is driving me nuts. I'm about ready to downgrade to Fedora 24 in the hopes that it isn't using the same level of KDE.
Work-around: switched from using keyboard/mouse combo that shared one usb dongle. Instead, using same keyboard but a different mouse that has its own usb dongle. Not perfect, but dramatically reduced the problem. I had the idea for this work-around because the problem exists only on my desktop, not on my laptop.