Screen flashes when opening other windows.

[Jeff.m]

system Kubuntu 16.04 - backports enabled.
uname -a
Linux chainsaw-server 4.4.0-22-generic #40-Ubuntu SMP Thu May 12 22:03:46 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
nvidia driver = 364.19
graphics card = nvidia 980
OpenGL version 4.5

X.Org X Server 1.18.3
Release Date: 2016-04-04
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.13.0-86-generic x86_64 Ubuntu
Current Operating System: Linux chainsaw-server 4.4.0-22-generic #40-Ubuntu SMP Thu May 12 22:03:46 UTC 2016 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic.efi.signed root=UUID=12498d04-a56d-4154-a205-002a33db41d0 ro noprompt quiet splash nomdmonddf nomdmonisw vt.handoff=7
Build Date: 18 May 2016 01:07:07AM
xorg-server 2:1.18.3-1ubuntu2.2 (For technical support please see http://www.ubuntu.com/support)
Current version of pixman: 0.33.6

Package associated with bug = plasmashell

When an application is opened the desktop screen flashes. The application can be from wine, konsole, dolphin or any other application. When opened the screen flashes with a black background if it is opened up not as full size. It seems like there is another black layer layer that is flashing alongside the background image. If you move the smaller application window around it "erases" the flashing black background and removes the flashing if you "erase" all of the window. Though when you close and open another application it starts all over. There is not any flashing over a window opened so it takes up the full screen. Flashing only occurs over the desktop wallpaper.

I have noticed this only happens after running a full screen application like a game. For example I run a game like Dying Light or Left 4 Dead 2 in steam and after I close out of the game, that is when I get the flashing. After a reboot everything is fine until I run another full screen application. I should note when I say full screen it isn't a window that is maximized.

Toggling the Compositor off will stop the issue. When turned back on the flashing will still be there.

Expected results is no screen flashing.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1587997/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Jeff.m (vsteel)]

The package I believe is plasmashell that this bug should be associated with but I can't pick it from the drop downs.

[Jeff.m (vsteel)]

I have noticed this only happens after running a full screen application like a game. For example I run a game like Dying Light or Left 4 Dead 2 in steam and after I close out of the game, that is when I get the flashing. After a reboot everything is fine until I run another full screen application. I should note when I say full screen it isn't a window that is maximized.

[Jeff.m (vsteel)]

I have found that if I turn off the composter the flashing will go away. So it is somewhere in the composter code. Using the alt-shift-F12 keys I can toggle the flashing. It comes back as soon as I turn the composter back on.

[Jeff.m (vsteel)]

The above comment should say Compositor instead of composter.