Is there a way to display HDR in Gnome with its experimental feature?

[laichiaheng]

I've heard that Gnome is able to turn on HDR mode by doing following steps:

1. press Alt+F2
2. input lg
3. input global.compositor.backend.get_monitor_manager().experimental_hdr = 'on'

After doing these steps above, the screen becomes super bright, the color on desktop is really weird, so I know that HDR mode is on.

Here is my question. Can I play HDR videos in this mode with MPV player without tone-mapping to SDR?

Down below is my current HDR config in DRM mode (with amdvlk driver):

icc-profile=no
gpu-context=displayvk
target-trc=pq
target-prim=bt.2020

I tried to remove gpu-context=displayvk and ran this config in Gnome experimental HDR mode, the image seemed to be much brighter than in DRM mode.

Log file

Even if you think it's not necessary at first, it might help us later to find
possible issues. Make a log file made with -v -v or --log-file=output.txt, paste
it to https://0x0.st/ or attach it to the github issue, and replace this text
with a link to it.

[llyyr]

Your question was answered 8 months ago. This only forces one specific HDR mode, if your file happens to have the exact same metadata then it might work(?), otherwise no. Regardless you need target-colorspace-hint for it.

You can just run mpv under gamescope instead for HDR.

[laichiaheng]

@llyyr I forgot to mention that target-colorspace-hint was already in my config.
Isn't gamescope a Steam specific shell?

[llyyr]

Isn't gamescope a Steam specific shell?

No, you can run mpv under it.

gamescope --hdr-enabled -- mpv --target-colorspace-hint --fs [video] should hopefully work in a tty.

[laichiaheng]

Isn't gamescope a Steam specific shell?

No, you can run mpv under it.

gamescope --hdr-enabled -- mpv --target-colorspace-hint --fs [video] should hopefully work in a tty.

It works, but I need to log out first.
Why is the gamescope HDR looks much saturated than MPV with AMDVLK?

---

I figured out that I still need to add --target-prim=bt.2020, or should I?

[kasper93]

I figured out that I still need to add --target-prim=bt.2020, or should I?

Yes, --icc-profile=no --target-trc=pq --target-prim=bt.2020 --target-colorspace-hint for HDR "passthrough". Although most of this should be set automatically, don't remember rn. #12306 will help debug what is the actual output format, but not merged yet.

[ofarukaydin]

This is how I got it working in gnome:
1- Switch to hdr mode with global.compositor.backend.get_monitor_manager().experimental_hdr = 'on'
2- run mpv with mpv --vo=gpu-next --icc-profile=no --target-trc=pq --target-prim=bt.2020 --target-colorspace-hint --gpu-api=vulkan --gpu-context=waylandvk some-video-path

[Mutcholoko]

This is how I got it working in gnome: 1- Switch to hdr mode with global.compositor.backend.get_monitor_manager().experimental_hdr = 'on' 2- run mpv with mpv --vo=gpu-next --icc-profile=no --target-trc=pq --target-prim=bt.2020 --target-colorspace-hint --gpu-api=vulkan --gpu-context=waylandvk some-video-path

Thank you so much for this! It seems to work quite well!! Although now I'm wondering if it's proper HDR (including the pixel brightness changing features) or if it's just the correct color space. Would you have any info on this? Thank you, nonetheless.