Created attachment 116334 [details] screenshot illustrating the problem Original with apport information filed at https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1462147 Using Ubuntu-Mate 15.10 (development) amd64 Problem began upon upgrading of xserver-xorg-core_1.17.1-0ubuntu3_amd64 and xserver-xorg-common_1.17.1-0ubuntu3_amd64xorg to xserver-xorg-core_1.17.1-0ubuntu4_amd64 and xserver-xorg-common_1.17.1-0ubuntu4_amd64xorg and was resolved by reverting to the pre-upgrade packages. Apparently random text characters, or parts thereof, would be missing in various applications including the Lightdm greeter, Firefox, Pidgin, Mate-terminal, the Mate panel clock, Unetbootin, and the Mate menu. This occurs both at my monitor's native resolution (1680x1050) and at 1600x1200. Other possibly useful info: libdrm-nouveau2:amd64 2.4.60-3 amd64 xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1 amd64 FWIW, Fedora Rawhide displays properly for me with xorg-x11-server-common-1.17.1-14.fc23.x86_64 xorg-x11-server-Xorg-1.17.1-14.fc23.x86_64 xorg-x11-drv-nouveau-1.0.11-3.fc23.x86_64
Using today's upgraded nouveau driver, along with (the formerly problematic) xserver-common and xserver-xorg-core has fixed the problem. Working configuraiton: xserver-common 2:1.17.1-0ubuntu4 xserver-xorg-core 2:1.17.1-0ubuntu4 xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3 Changing status to Resolved fixed
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.