Huaxing screens must be much more efficient than Tianma, because I have trouble exceeding 5H SOT on a day with Wifi, with a light use (without gaming...)Mine was Huaxing, M2101K9G (global).
Display is fine. Texts are sharp and clear even with tiny and thin font.
Battery is also very good. SOT ~ 6h30 with dual sim, 4G all day. I'm not a gamer.
my dump file info :
DisplayDxe: K9 42 02 0b amoled dsc cmd