After upgrading from f25 to f26, my display showed flickering, when opening new windows, when opening some popup menus, when playing videos. Thanks to [Enrico] from #fedora IRC channel who informed me about the need to use a compositor to avoid flickering. I found a howto page that explained how to control the use of compositing with xfwm4. On my system the following command returned false: xfconf-query -c xfwm4 -p /general/use_compositing I ran this: xfconf-query -c xfwm4 -p /general/use_compositing -s true And the flickering seems gone. I suspect that my local configuration files, which were automatically created when I installed a past version of Fedora a while ago, had set this preference to false. I guess that many people might run into a situation like this when upgrading. In the past I never knowingly made a configuration to request for compositing to be set to false. Maybe there should be a smarter way of setting default configurations, when defaults needs to change.
compositing is off by default because some hardware doesnt support it. However anything at all new does, so we could look at changing the default. That would likely be a discussion for the fedora-xfce list. I'm not sure there's much we could do for defaults. Many of them stay the same and we don't want to remove a users choices.
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