Created attachment 105575 [details] Screenshot with Scale 1 For example, when connecting to a Mac that is running at native 1920x1080 (no HighDPI on the other side), with a local 3200x1800 highdpi screen: Test 1: run QT_SCREEN_SCALE_FACTORS=1 krdc and connect In this case, the remote's 1920x1080 is scaled up to 3200x1800 and looks sharp. See Screenshot_Scale1.png Test 2: run QT_SCREEN_SCALE_FACTORS=2 krdc and connect In this case, the remote's 1920x1080 is downscaled to 1600x900 and then scaled back up to 3200x1800. It looks blurred. See Screenshot_Scale2.png
Created attachment 105576 [details] Screenshot with Scale 2
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Problem does indeed appear to be gone.