I've been thinking of making a test that will allow us to check if pixels flicker without a need to magnify them, so every screen can be checked this way in a shop, at work, etc.
A bit of intro: After observing screens behavior (https://ledstrain.org/d/409-screens-under-microscope-in-slowmo-dithering-frc-tests/30) I noticed that they tend to alternate flickering and not flickering rows or columns. Then I thought a pattern of alternating green & black dots could reveal flicker if they do it at once. As a result I realised, that it's actually almost the same as pixel inversion patterns on Lagom site: http://www.lagom.nl/lcd-test/inversion.php#invpattern . @KM even suggested it could be polarity inversion in one of the posts.
So basically - if it was polarity inversion (not FRC / dithering) that flickers, maybe it would be easier to test the screens.
I know some of you have known good setups that don't cause issues like @JTL 's Macbook with AMD card and also setups that are causing quick eye strain. Could you post results of testing if any of Lagom images causes flicker on both categories? Please remember to check it in native resolution, so it doesn't look like e.g. set of rectangles, it has to be pixel perfect.
My screen shows significant flickering on 1 and 3, but also 2a, 2b and others look not 100% stable. If we gather enough data maybe there will be some correlation (like - screens with specific flicker or more flickering examples are worse).