I boot into Windows for gaming and when I launch a full screen game an "AutoHDR" badge pops up and the brightness limit is lifted. A similar thing happens when I launch a streaming app in the TV. I don't consume content through Linux because as far as I can tell linux doesn't support HDR yet.

Speaking of booting into Windows, I finally figured out how to make it painless: use a separate hard drive, not a separate partition. I wish I could go back in time 20 years and tell myself that. The number of hours I wasted debugging poorly written installers, bootloaders, and updaters exceeds the cost of hard drives by a factor too terrifying to calculate. Ah well. Now I know.