Television HDR mode is set to FILMMAKER, OLED brightness 100%, Energy Saving Mode is off. Connected to AVR with HDMI cable that says 8K.

  PC has Manjaro Linux with RTX 3060 12GB

  Graphic card driver: Nvidia 580.119.02

  KDE Plasma Version 6.5.4

  KDE Frameworks Version: 6.21.0

  Qt Version: 6.10.1

  Kernel Version 6.12.63-1-MANJARO

  Graphics Platform: Wayland

  High Dynamic Range: Enable HDR is checked

  There is a button for brightness calibration that I used for adjustment.

  Color accuracy: Prefer color accuracy

  sRGB color intensity: This seems to do nothing (even after apply). I've set it to 0%.
  Brightness: 100%

AVR is reporting...

  Resolution: 4KA VRR

  HDR: HDR10

  Color Space RGB /BT.2020

  Pixel Depth: 10bits

  FRL Rate 24Gbps

For Firefox 146.0.1 by default there is no HDR option on Youtube. 4K video clearly doesn't have HDR. I enabled HDR in firefox by going to about:config and setting the following to true: gfx.wayland.hdr, gfx.wayland.hdr.force-enabled, gfx.webrender.compositor.force-enabled. Color look completely washed out.

For Chromium 143.0.7499.169 HDR enabled by default. This looks like HDR.

I downloaded the HDR video from Youtube and played it using MPV v0.40.0-dirty with settings --vo=gpu-next --gpu-api=vulkan --gpu-context=waylandvk. Without these settings the video seems a little too bright like the Chromium playback. This was the best playback of the three on Linux.

On the Blu-ray the HDR is Dolby Vision according to both the TV and the AVR. The AVR is reporting...

  Resolution: 4k24

  HDR: Dolby Vision

  Color Space: RGB

  Pixel Depth 8bits

  FRL Rate: no info

I would say the colors over all look better on the Blu-ray.

I might be able to calibrate it better if the sRGB color setting worked in the display configuration. Also I think my brightness setting is too high compared to the Blu-ray. I'll play around with it more once the sRGB color setting is fixed.

*Edit: Sorry Hacker News has completely changed the format of my text.