I remember a number of years ago having openchrome on a computer (can't even remember which one off-hand) and yes, the video drivers were badly broken. It's nice to hear it may be fixed now.
As to your question, I'd start by doing a basic install of monolithic Xorg ... no need for any packages or configuration/customization. That is a very quick test with which you can run X. You will probably be able to tell very quickly if there's a video driver problem or not ... at least that was my experience back then. If there are problems you could consider if it's worth trying modular.
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