Diagonal half black window

[JoZCaVaLLo]

Hi...
Today I faced a strange problem: a customer phoned me and said "I can visualize only Half of your software... the other half is diagonal black"... I could not understand the issue until he sent me this print-screen:

His computer is a HP Probook 450 G5, Graphic card is Intel UHD graphics 620, the software uses Qt LTS 5.12.2

Maybe someone has already seen this and has a solution?

[mrjj]

Hi
Nope you won the big prize. :)
I have never seen any like that.
Also the triangle is so perfect!?

That said, intel Intel UHD graphics 620 have been known for having issues but most of the reports
are about openGL. Not normal Desktop use. And the end result was always freezing or direct crashes.

Do you have any QML / openGl in the application?

What platform is this on ? ( seems win 10)

First thing i would do is to ask if he has updated the drivers recently.

[JoZCaVaLLo]

@mrjj said in Diagonal half black window:

Nope you won the big prize. :)

You are right... But trust me is not the kind of prizes I like to win :P

Yes, we use QML in our application.
The pc is a Windows 10, windows says drivers are up to date, I was not allowed to check with Intel Driver assistant.

[mrjj]

@JoZCaVaLLo

Yeah its doubtfull honor, i suppose :)

• I was not allowed to check with Intel Driver assistant.

That attitude from the clients makes it hard to work out.
The ordinary procedure would be to compare the actual driver version with the newest
https://www.intel.com/content/www/us/en/support/products/126789/graphics-drivers/graphics-for-8th-generation-intel-processors/intel-uhd-graphics-620.html
If newest / that version installed. try a downgrade and see. also openGL version check would be good.

Also running a QML test app on it to determine the scope of the issue. Is it only that app.
And so on.

[Cobra91151]

@JoZCaVaLLo

Hello!

Regarding this issue, it could be the problem with Visual Studio 2019 compiler (graphics glitch), check out these links:

https://ddgobkiprc33d.cloudfront.net/d4a40f37-5d0a-47f3-bf18-91956331efd3.gif?fbclid=IwAR05nfPjDYjIZBM9_ve8UvKgTL2mZ97obhutKphJo8cAs0vG2CxW2wfT1e4

https://bugreports.qt.io/browse/QTBUG-75280?fbclid=IwAR2U04xIY0J2c-ABFwxVjEh8lHmBtog6F6rtUoymm5Ds0C_wgSi6EBkiWBk

https://developercommunity.visualstudio.com/content/problem/547684/visual-studio-20191602-generator-incorrect-code-wi.html?fbclid=IwAR0cKYfrn5xTCtXaT3VJcK9b7LjoVOHFigWQzVESIOEpjCuzDhdr7Mm4s5k

https://developercommunity.visualstudio.com/content/problem/591474/qt-598-sharedstatic-build-with-msvc-2019-issue.html?fbclid=IwAR2rI5xDWbIAZH-cYN1GpwbksvPnTlcvyr1Z3VwtHybdAMniA2_Y9ch5J-4

But it could be already fixed by Microsoft, so you have to check it. Using Visual Studio 2017 compiler it does not have such graphics glitch issue.

Also, regarding QML, it can use OpenGL (opengl32sw.dll) or ANGLE (libEGL.dll, libGLESV2.dll). Early this year I done some investigation because of the QML graphics issues on some systems. So, I rebuilt Qt 5.9.X using these parameters:

-opengl dynamic -angle -combined-angle-lib -no-feature-d3d12

Then I verified that it working well on Win Vista, 7, 8, 10 and Win 10 IP. You also can try to rebuild Qt using these parameters to check if it fixes your graphics issue.