Using Kubuntu 16.04 on a Thinkpad X240 with Intel graphics this problem
also causes Yakuake ("Quake-style terminal emulator based on KDE Konsole
technology") to remain invisible when activated. It still accepts input
and the window is in focus, it just is not visible.Switching the compositor rendering backend from OpenGL to XRender works around the problem but the XRender backend seems to cause massive screen tearing when scrolling or watching videos so this workaround is suboptimal. Installing xserver-common and xserver-xorg-core from ppa:canonical-x/testing fixes the issue! -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1780664 Title: Recent libgl-mesa graphics update prevents drop down list menu appearing in apps like firefox three line/bar menu icon Status in xorg-server package in Ubuntu: Invalid Status in xorg-server source package in Xenial: Triaged Bug description: PROBLEM Recent libgl-mesa 18.0.5-0ubuntu0~16.04.1 graphics update prevents drop down list menu appearing in apps like firefox three line/bar menu icon. After recently applying updates, left clicking on some application menus and icons no longer displays a drop-down menu list. For example in Firefox when I left-click on the **three line/bar** icon in the upper right-hand corner, the normal drop down list menu does not display. Also the menu drop down doesn't display in keypassx. Further xchat-gnome doesn't even display a window. Another anomaly is that my KDE bottom menu bar changed to a dark theme. BACKGROUND I'm using Kubuntu 16.04 on an Intel i7-7700k computer with Intel HD Graphics. I have KDE **System Settings -> Compositor** enabled with: Scale method : Accurate Rendering backend: OpenGL 3.1 OpenGL interface: GLX Tearing prevention ("vsync"): Full screen repaints Keep window thumbnails: Only for Shown Windows INVESTIGATION After several hours of searching the Internet I found one other case of a similar problem. Firefox's Menu Bar won't open https://support.mozilla.org/en-US/questions/1194760 The reported solution was to rollback the graphics drivers. Because the issues cropped up after applying updates on July 6, 2018, I tracked down the list of recent updates with: grep -A 2 'Start-Date: 2018-07-06' /var/log/apt/history.log | tail -1 >packages.txt After some editing to place packages on separate lines, and identifying the grahics libraries, I arrived at the following list: ------------------------------ libgles2-mesa:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1) libglapi-mesa:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1) libglapi-mesa:i386 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1) libxatracker2:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1) libegl1-mesa:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1) libgbm1:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1) libwayland-egl1-mesa:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1) libgl1-mesa-dri:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1) libgl1-mesa-dri:i386 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1) libosmesa6:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1) libosmesa6:i386 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1) libgl1-mesa-glx:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1) libgl1-mesa-glx:i386 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1) mesa-vdpau-drivers:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1) ------------------------------ To revert to the prior graphic drivers I tracked down the '.deb' packages for each of the above packages and downloaded the '17.2.8-0ubuntu0~16.04.1' version. For example: https://launchpad.net/ubuntu/xenial/amd64/libxatracker2/17.2.8-0ubuntu0~16.04.1 I also discovered that some of these depended on libllvm5.0_5.0-3~16.04.1 so I also downloaded the following files: libllvm5.0_5.0-3~16.04.1_amd64.deb libllvm5.0_5.0-3~16.04.1_i386.deb WORKAROUND (ROLLBACK TO PRIOR VERSION) Install older versions with: sudo dpkg -i \ libllvm5.0_5.0-3~16.04.1_amd64.deb \ libllvm5.0_5.0-3~16.04.1_i386.deb \ libegl1-mesa_17.2.8-0ubuntu0~16.04.1_amd64.deb \ libgbm1_17.2.8-0ubuntu0~16.04.1_amd64.deb \ libgl1-mesa-dri_17.2.8-0ubuntu0~16.04.1_amd64.deb \ libgl1-mesa-dri_17.2.8-0ubuntu0~16.04.1_i386.deb \ libgl1-mesa-glx_17.2.8-0ubuntu0~16.04.1_amd64.deb \ libgl1-mesa-glx_17.2.8-0ubuntu0~16.04.1_i386.deb \ libglapi-mesa_17.2.8-0ubuntu0~16.04.1_amd64.deb \ libglapi-mesa_17.2.8-0ubuntu0~16.04.1_i386.deb \ libgles2-mesa_17.2.8-0ubuntu0~16.04.1_amd64.deb \ libosmesa6_17.2.8-0ubuntu0~16.04.1_amd64.deb \ libosmesa6_17.2.8-0ubuntu0~16.04.1_i386.deb \ libwayland-egl1-mesa_17.2.8-0ubuntu0~16.04.1_amd64.deb \ libxatracker2_17.2.8-0ubuntu0~16.04.1_amd64.deb \ mesa-vdpau-drivers_17.2.8-0ubuntu0~16.04.1_amd64.deb After rebooting, all the issues disappeared. For example I was once again able to left-click on the Firefox **three line/bar** menu and view the drop down list menu. Also the KDE bottom menu bar retured to the normal "breeze" light grey colour. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1780664/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
