Steam Deck and HDMI: Wrong colors when refresh rate is on 50

[bziemons]

When I was looking for ways to reproduce (or not reproduce) the issue #549, I found out that the colors coming through HDMI seemed different on refresh rate 50. What's annoying about this is that the gamma is off by a lot on refresh rate 50 and dark areas in-game can basically not be seen. This could, however, be a hardware issue of my HDMI to USB capture card (Sunplus Innovation Technology Inc. FHD Capture based no-name product). I am grabbing video via gstreamer & v4l2 via the following pipeline: v4l2src device=/dev/video0 ! watchdog ! video/x-raw,format=YUY2,width=1920,height=1080,framerate=60/1,colorimetry=(string)1:4:16:1 ! videoconvert ! … (e. g. waylandsink)

For better understanding, see the following screenshots:

Bad	Good enough

[misyltoad]

We probably dont want to be exposing arbitrary refresh rates for external displays. It works... sometimes, but itll never have 100% coverage. For the internal display, we use custom clocks for that exact reason.

[ruineka]

We probably dont want to be exposing arbitrary refresh rates for external displays. It works... sometimes, but itll never have 100% coverage. For the internal display, we use custom clocks for that exact reason.

Speaking of this, where exactly is this specified? I've been experimenting with a OneXPlayer internal display and I've noticed different ranges that work on Holoiso vs ChimeraOS. Holoiso having a much larger range that works.