Missing display updates with Intel Iris Xe graphics - continued

[EckartRS]

continued from

Graphics/Missing-display-updates-with-Intel-Iris-XE 

In our WPF application we have an update problem, which only appears on PCs with the Intel Iris XE graphics card.

In the application there is an animation done by the use of a System.Windows.Media.Imaging.WriteableBitmap, attached to a System.Windows.Controls.Image as "Source"

NO display update is seen on PCs with the Intel Iris XE graphics card, while it works well with other PCs. An update ist only seen, when for e.g. the window is resized.
Looks like a driver problem, but we already installed the most recent display driver.

examples according to https://docs.microsoft.com/de-de/dotnet/api/system.windows.media.imaging.writeablebitmap?view=net-5....

m_myWriteableBitmap.WritePixels(UpdateRegion, m_PixArray, 4 * 100 /* stride */, 0 /* offset */);

does not lead to the expected display update.

I could now reproduce the same issue on a different laptop (dell inspiron) where I can test display driver or bios updates more easily.

- The sourcecode of the test is attached

- The output of the ssu tool is attached

- The expected output (diagonal line is drawn and moving)  and the erroneous output  (line is not drawn) is attached

Thanks very much for any hints

Eckart

[Alberto_R_Intel]

EckartRS, Thank you for posting in the Intel® Communities Support.

In order for us to provide the most accurate assistance on this scenario, we just wanted to confirm a few details about your system:

Are you a developer?

Are you working on a project?

Are you building, designing, or modifying hardware/software?

Are you working with a specific Intel® hardware/software platform besides the Intel® Iris® Xe Graphics controller?

Was the WPF application working fine before with the Intel® Iris® Xe Graphics controller?

If that is the case, by any chance do you remember the graphics driver version?

When did the issue start?

Did you make any recent hardware/software changes?

Does the problem happen at home or in the work environment?

Any questions, please let me know.

Regards,

Albert R.

Intel Customer Support Technician

[EckartRS]

Hello, thank you very much for your reply. 

We meanwhile could install a set of driver updates from Dell, 

and on both machines (Dell Latitude  in the previous thread and Dell Inspiron here), the problem is now solved. 

The new  driver of the Intel Iris XE  is  27.20.100.9749  (Date 24/06/2021)  seems to fix it. 

Thank you very much

best regards

Eckart

[Alberto_R_Intel]

Hello EckartRS, You are very welcome, thank you very much for sharing those results.

Perfect, excellent, it is great to hear that the problem got fixed on both "Dell Latitude in the previous thread and Dell Inspiron here" after installing the drivers from Dell. That is something that we always recommend, to install the drivers provided by the manufacturer of the computer since those drivers were customized by them to work with your specific platform.

Thank you very much for sharing the solution in the Intel® forums as well, we are sure it will be very helpful and useful for all the peers looking at this thread.

Any other inquiries, do not hesitate to contact us again.

Regards,

Albert R.

Intel Customer Support Technician

[EckartRS]

hello, 
yes, it is interesting, we have of course already tried to install latest drivers previously (august),  but either  earlier than this patch was available, or indeed we took them from the Intel page, not from the DELL page. This seems to be a good hint.

Thanks and best regards
Eckart 

[Alberto_R_Intel]

Hello EckartRS, You are very welcome, thank you very much for your response.

"but either earlier than this patch was available, or indeed we took them from the Intel page, not from the DELL page", yes indeed, even though the Intel® graphics drivers are generic, they might work with your platform just fine and will be able to fix different problems. Still, the drivers provided by the manufacturer should do the same, keep in mind that they can add fixes on the drivers as well. So, if at some point you decide to install the drivers from the OEM (Original Equipment Manufacturer) and there are some problems with the computer after that, we advise to get in contact with them directly to report this scenario so they can try to add a fix to their driver or provide any other solution to that scenario.

Regards,

Albert R.

Intel Customer Support Technician