This appears to be the same bug I am experiencing. Graphical regression
Kubuntu xenial/16.04.4 Intel HD Graphics 530 Symptoms: * Under KDE Plasma 5, the blur effect for most widgets with a transparent background is not rendered. Instead, an opaque background is rendered. * The on-screen display provided by KMix when adjusting the volume using keyboard hotkeys is not rendered. Instead, only its background blur effect is rendered. * In some applications, some pop-up menu widgets do not render (they are invisible). For example, in Clementine, the drop down menu on the Stop button does not appear visibly when summoned, the main menus do not appear visibly when summoned, and the right-click menu does not appear visibly when summoned. In Firefox, the all-in-one "hamburger" menu, as well as other pop-ups from the main toolbar, do not appear visibly when summoned. However, the main menus (accessed by pressing Alt, if hidden) do appear. In the print dialogs in Okular, the drop-downs for "Page set" and for printer-specific settings do not drop down. (Selection has to be made by blindly scrolling through options using the arrow keys.) As remarked by others, menu and volume OSD visibility is restored by using XRender instead of OpenGL 3.1, but there is no background blur effect and the background of Plasma widgets remains opaque. For completeness, here are the results of my investigation into which packages were causing the problem. This seems very similar to what has already been said. The symptoms appeared after upgrading some packages using the package manager (aptitude). The following subset of the package upgrades that took place appear to have caused the symptoms, since downgrading only these packages eliminates the symptoms: package / old version / new version libwayland-egl1-mesa:amd64 17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1 libdrm-common:all 2.4.83-1~16.04.1 2.4.91-2~16.04.1 libdrm-dev:amd64 2.4.83-1~16.04.1 2.4.91-2~16.04.1 libdrm2:amd64 2.4.83-1~16.04.1 2.4.91-2~16.04.1 libdrm2:i386 2.4.83-1~16.04.1 2.4.91-2~16.04.1 libdrm-intel1:amd64 2.4.83-1~16.04.1 2.4.91-2~16.04.1 libdrm-intel1:i386 2.4.83-1~16.04.1 2.4.91-2~16.04.1 libdrm-radeon1:amd64 2.4.83-1~16.04.1 2.4.91-2~16.04.1 libdrm-radeon1:i386 2.4.83-1~16.04.1 2.4.91-2~16.04.1 libdrm-nouveau2:amd64 2.4.83-1~16.04.1 2.4.91-2~16.04.1 libdrm-nouveau2:i386 2.4.83-1~16.04.1 2.4.91-2~16.04.1 libdrm-amdgpu1:amd64 2.4.83-1~16.04.1 2.4.91-2~16.04.1 libdrm-amdgpu1:i386 2.4.83-1~16.04.1 2.4.91-2~16.04.1 libegl1-mesa: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 libgl1-mesa-dri:amd64 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 libsensors4:i386 [not previously installed] 1:3.4.0-2 There were other package upgrades at the same time, but downgrading only these packages eliminated the symptoms. There are no symptoms with the following versions: package / version downgraded to libwayland-egl1-mesa:amd64 11.2.0-1ubuntu libdrm-common:all 2.4.83-1 libdrm-dev:amd64 2.4.83-1 libdrm2:amd64 2.4.83-1 libdrm2:i386 2.4.83-1 libdrm-intel1:amd64 2.4.83-1 libdrm-intel1:i386 2.4.83-1 libdrm-radeon1:amd64 2.4.83-1 libdrm-radeon1:i386 2.4.83-1 libdrm-nouveau2:amd64 2.4.83-1 libdrm-nouveau2:i386 2.4.83-1 libdrm-amdgpu1:amd64 2.4.83-1 libdrm-amdgpu1:i386 2.4.83-1 libegl1-mesa:amd64 11.2.0-1ubuntu libgl1-mesa-dri:i386 11.2.0-1ubuntu libgl1-mesa-dri:amd64 11.2.0-1ubuntu mesa-vdpau-drivers:amd64 11.2.0-1ubuntu libsensors4:i386 [removed] (N.B. I downloaded the 2.4.83-1 versions of the libdrm packages manually from archive.ubuntu.com since the older version 2.4.67-1 in the xenial repository created many dependency problems. These are therefore not precisely the same package version as they were before the upgrade that caused the symptoms.) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to mesa 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 mesa package in Ubuntu: Confirmed 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/mesa/+bug/1780664/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp