I really appreciate your input here and your workaround.
Our development had a look at this issue together with a lot of customers who had the same problem.
We also made some tests with these customers and the new option within TeamViewer was especially developed for this behavior. Our customers already confirmed during the tests, that this option will solve the problem.
Thanks for your suggestions to create a Knowledgebase article about it and indeed - I can confirm that we will publish a Knowledgebase article about the new option within TeamViewer in the near future.
This InsiderBuild with Hardware Acceleration turned off and Duet installed fixed the issues for me.
Prior to the InsiderBuild, I had to uninstall Duet to avoid the blank black screens in Teamviewer.
I tried everything else, including the development builds - deleting Duet is what did it for me.
My point was slightly different - while it's useful to have the option to turn off acceleration for TeamViewer, this doesn't seem to be the real root cause of the problem, but rather a workaround (that also doesn't appear to work for many). The real root cause - at least for *everyone* on this thread, was Duet. Uninstalling Duet is the real solution, and that's what I suggested to document in a knowledgebase article. Disabling acceleration in TeamViewer is useful in these cases where Duet cannot be uninstalled (or isn't installed to begin with - some other variation of this issue).
By the way - disabling acceleration was also the recommendation from Steam - to solve somewhat similar issues. For me at least, this didn't work - and there are apparently others here for whom disabling acceleration doesn't actually solve the problem. For me - TeamViewer, Steam, Yi Home, Microsoft Expression Studio - all had similar issues that only went away when Duet was uninstalled.
It was a while ago, but I think what made me attempt to try to start uninstalling apps, was the fact that I submitted a ticket to Intel - which failed to reproduce this issue on a very similar system. So it seemed at least plausible that it wasn't something in the driver. They suggested that I reinstall my system from scratch, which obviously I was reluctant to do - but to give credit where credit's due - it pushed me to see if this might be some other software that was somehow conflicting with the Intel driver and was unique to my system. When I went in this direction, the Eureka moment of this being Duet wasn't that far off. If anything could have an impact on video behavior, Duet would be it...
Still, it took me a very very very long time to go in this direction. I was already looking for external video cards. Very thankful I had this Eureka moment :)
I didn't have display duet installed but found that I still had the black screen issue upon connection.
I've found that toggling the display optimisation for speed gets rid of the black screen on both pc and mobile.
Hope this helps
Amazing work, thanks a lot. That Duet software was the cause of my blackscreen on Teamviewer. Those guys at Duet never really got their software 100%.
I have seen you link this "solution" on many threads that have the same topic.
However, I can assure you this is a new thing presumably with Windows itself.
I have been using TeamViewer for years on the same workstations and only recently have I ran into this problem. There has got to be a solution to get the graphics cards to not go to sleep.