Hi, if you had no issues with Windows 10, and Windows 11 is unusable please try this and tell if it works for you.
You should have:
Safe laptop with UHD graphics and HDMI you can use Windows 10 but not Windows 11.
You have Windows 11 installed on it you can't use, with standard Intel drivers from Windows update
Safe external screen with HDMI, you have no issues with.
Next:
-Connect them directly with HDMI to HDMI without any adapter.
Open Intel Graphics Control Panel and disable "Text content"
It works only with HDMI screens,
"Text content" shows only with HDMI connections
It doesn't work for internal laptop screen
Probably wouldn't work with adapters
I found explanation online - When "IT content" (Text content) is disabled , it's supposed to bypass all Intel HD Graphics display processing and send unchanged data to the display.(Desktop colour correction, overscan, video levels etc).
Please tell if you can use Windows 11 with external screen after