voodoodrul: Thank you very much for contacting the Intel® Graphics communities. We will do our best to try to fix this problem.
For this type of scenario what we recommend is to install the latest graphics driver version provided by Dell, version 4542, please look for ‘Video” on the following link to install the drivers:
If the problem persists after that, since the laptop is working with Intel® HD Graphics 530, we can try driver 4849:
As a workaround you can try to get in contact with Microsoft to disable the Windows automatic updates:
I found a link with some suggestions about how to do that:
The content on the above site is not controlled by Intel. This information is offered for your convenience and should not be viewed as an endorsement by Intel for the merchants or services offered there
Any further questions, please let me know.
Thanks Alberto. Unfortunately, no joy. The neither 4542 nor 4849 solve the problem. I have blocked automatic driver updates, that's okay, but I would like to use the real driver to get reasonable performance. The fallback driver is very slow. I'm guessing it will work just fine if I remove the dGPU, but I need that for compute.
voodoodrul: You are welcome. Thank you very much for providing those results., we are sorry to hear the issue persists.
The driver provided by Dell should work for your platform, another troubleshoot step we can try is to set 1920x1200 as a custom resolution and confirm if that fixes the problem. Other than that the next thing to do will be to get in contact with Dell directly for further technical or warranty assistance:
Any questions, please let me know.
Custom resolutions won't work unfortunately. It says that 1920x1200 exceeds the available bandwidth (it doesn't). Dell probably can't support this since it's a third party driver issue, and disabling the Intel driver shows the hardware is capable on the fallback driver. It would take hours of support work to make no progress. I think it would need to be recreated by someone on the driver team for anything useful to come of it.