You seem to be using FVWM and the old Intel driver (not the current one). So I would try eliminating those as possible causes.
1. Does the bug also occur in Gnome Shell Xorg sessions? (log into 'Ubuntu') 2. Please edit or move or delete /etc/X11/xorg.conf so that Xorg does not load the 'intel' driver. We would prefer it to load the newer 'modeset' driver. ** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu) ** Also affects: fvwm (Ubuntu) Importance: Undecided Status: New ** Also affects: xserver-xorg-video-intel (Ubuntu) Importance: Undecided Status: New ** Changed in: fvwm (Ubuntu) Status: New => Incomplete ** Changed in: xorg-server (Ubuntu) Status: New => Incomplete ** Changed in: xserver-xorg-video-intel (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1850635 Title: Some applications don't redraw their windows correctly To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/fvwm/+bug/1850635/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp