Basically i updated over 800 computers from our company to 1903 and now i face the remote desktop issue for over 600 users. I updated the display drivers and still the same issue.
Basically when connecting they get a black screen and if for some reason its passing this black screen then its gets slow and not responsive and then it gets disconnected.
Updating the video driver, while being the standard procedure, has never been successful for me, and I did not remember reading someone in this thread for which it were either.
What was proposed instead was to remove the "correct" video driver and instead using the "Basic
Microsoft Driver"; it somehow works for the old machines where the normal (WDDM-compliant and hardware-specific) driver is broken; however, if is solves connecting remotely with RDP, it also makes using the machine live pretty difficult (among
other, resolutions are limited to 4÷3 ratios); as aptly put by ErnestL, pick your poison.
If I understand correctly, "disabling the WDDM driver" using GPO (or forcing
fEnableWddmDriver to 0 in registry) is effectively forcing the use of the "Basic
Microsoft Driver" over a RDP session, while keeping using the hardware-specific (WDDM) driver on the bare hardware; for me it is the best solution. But if this trick does
not work for you, I can guess that
always forcing the use of the "Basic
Microsoft Driver" won't work.
Also although I have much less computers than you ("only" 9 machines affected, of 4 different models, all with the '08 Series 4 chipsets, G4x or Q4y), I was never able to pass over the black screen in any test. In addition, unless you have 10,000s of machines
in total, I am not sure you really have 600 machines with old video chipsets.
So I guess you are in a different case than most of us in this thread.
Something very different which was reported (Phil Angus on August 7th) was to have some web filtering installed, namely Forcepoint Websense or Carbon Black ("CB Sensor"). They reported success disabling that software.
I hope your problem will be solved.