07:35 <narmstrong> cyph84: https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/meson/meson_overlay.c#L182 the limit is set as 1/5 and 5/1

07:35 <narmstrong> this is undocumented so it's more a guess than an actual physical limit

08:18 <cyph84>  narmstrong: thanks!

08:22 <cyph84> narmstrong: i am having another issue with the overlay. Displaying NV12 video on plane 37 and overlaying it with a UI on plane 34. It seems like on some refresh rates the alpha of the overlay is shifted ~20 pixels away from the colour

08:22 <cyph84> this is bad: #0 1360x768 60.02 1360 1424 1536 1792 768 771 777 795 85500 flags: phsync, pvsync; type: preferred, driver

08:23 <cyph84> this is barely noticable, but induces black shadow around the text: #0 1280x720 60.00 1280 1390 1430 1650 720 725 730 750 74250 flags: phsync, pvsync; type: preferred, driver