Problem Screen - Mouse - right upper corner

[zerobrain]

Hi,

i have a strange problem:

What i see:
When i move the mouse - not klicking or anything from the down left to the upper right corner the screen turns more and more blue "foggy" (the "fog" is most intense on the upper right corner).
The color does not change when i change the background color.
This is consistent with the position of the mouse (again: not clicking). It´s overlaying any screen content.

What i did:
Installed 18.04 kubuntu LTS.
Installed Teamviewer / Virutal Box.

What i use:
Intel 4th gen Graphics controller (rev. 06) on a intel 4th gen CPU.

I clicked through menus and active egdes but couldn´t find anything - can anybody help?

[GreyGeek]

Make & model of mouse?
What's being used for the driver? (lsmod).
Display chip and driver?

[Snowhog]

IF you deactivate screen edges, does the 'blur' go away?

[jlittle]

That sounds very like a desktop effect of some kind. If you "suspend compositing", default keyboard shortcut Alt-Shift-F12, does it stop happening? If so, the cause is something like a desktop effect.
Now, a lot of the KDE goodness comes from compositing, so that's not a solution.

I clicked through menus and active egdes but couldn´t find anything

When you went to system settings->desktop behaviour->screen edges, did it look like this? (Please excuse my colour scheme, your colours will be different.)

If I mouse over the top right little box, I get

I ask this because mousing over a small part of something isn't obvious; not to me, anyway.

[zerobrain]

Thanks for all your replies. I think i soled it, but it´s none of the above - it goes away after changing the rendering from OPENGL...

I made a short video showing the effect. Its a recording from teamviewer (causing some artefacts).

lspci
00:00.0 Host bridge: Intel Corporation 4th Gen Core Processor DRAM Controller (rev 06)
00:02.0 VGA compatible controller: Intel Corporation 4th Generation Core Processor Family Integrated Graphics Controller (rev 06)
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06)
00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 04)
00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 (rev 04)
00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-V (rev 04)
00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 04)
00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation H87 Express LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller (rev 04)

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[claydoh]

Is Kubuntu running as a virtual machine? Or is this via a remote desktop connection via Teamviewer?

[zerobrain]

Is Kubuntu running as a virtual machine? Or is this via a remote desktop connection via Teamviewer?

Ok. I shouldn´t have mentioned VirtualBox.

Kubunutu is running natively "bare metal" on the machine.

[nhtrader]

kubuntu 18.04
KDE plasma v5.12.6
KDE frameworks v5.44.0
Qt v5.9.5
Kernel v4.15.0-29-generic
OS type 64-bit
Intel Core i3-6100
RAM 8Gb
Screen 1920x1080
Intel HD Graphics 530(Skylake GT2)
OpenGL v3.0 Mesa 18.0.5

I have the same problem. Thanks for mentioning changing the rendering backend. Changing this setting disabled this unexpected desktop effect.
I used the following steps to fix my desktop...

Select Kstart|Sytem Settings
Left Column Select Hardware (Displays and Monitor)
From sub-categories(Displays, Compositor, Gamma) select Compositor.
Select dropdown Rendering backend then choose XRender
Click the Apply Button, annoying desktop effect gone.

BTW, my dropdown only has 3 options: OpenGL 2.0, OpenGL 3.1, XRender
Both OpenGL 2.0 & 3.1 produce this odd desktop effect. XRender does not on my system.

Thanks again for your insight.

[Rod J]

I just watched zerobrain's video and that is one strange effect happening there. Like jlittle I thought it was something to do with the screen edges but clearly it's more than that.

I'm using an older Haswell Core-i5 with Intel HD graphics and I've never seen anything like that blue tinge with any of the three options selected for rendering.