Oshim The issue with sRGB mode on certain monitors is that you lose brightness control entirely. So then you have to set up your work environment around the monitor(s), instead of vice versa. Agreed though, sRGB modes that I’ve seen tend to be the most comfortable.
Back to the question at hand, I hope we can find an answer. Probably the most comfortable screen I’ve looked at in a while was on an old HP laptop reported (by Windows) to be running at 6-bit color depth.
I am working on acquiring a BlackMagic capture device so I can help with the empirical testing folks are doing here. I don’t know what the software interface looks like yet, but I am assuming if a 6-bit link is negotiated/detected, we would have our answer easily. Otherwise, it seems that we would have to capture a sample and analyze it programmatically to evaluate the state of those extra two bits in each pixel. I have some experience working programmatically with still images (not so much with video), but I wonder if we would need to create a solution from scratch or if an off-the-shelf tool exists.