6 ms·

You can enable, yes. But (assuming you're on an LCD display and not an OLED), you're likely still on XRGB8888 - i.e. 8-bit per channel. Check `drm_info`. Also,

You can enable, yes. But (assuming you're on an LCD display and not an OLED), you're likely still on XRGB8888 - i.e. 8-bit per channel. Check `drm_info`. Also, go to YouTube and play this video: https://www.youtube.com/watch?v=onVhbeY7nLM https://www.youtube.com/watch?v=onVhbeY7nLM Do it once on "HDR" on Linux, and then on Windows. The "HDR" in nVidia/Linux is fake. The brightness you see on Plasma or Mutter is indeed related to the HDR support in the driver. But - it's not really useful for the most common HDR tasks at the moment.

EnPissant 9mo ago
It's not obvious how to interpret the output. I pasted it into chatgpt and it thinks I am using "Format: ABGR2101010" for both monitors (only 1 has HDR on) so I don't trust it. EDIT: See my sibling comment.
- bitanarch 9mo ago
  Under the Planes section, look for planes that have non-zero "CRTC_ID". Those are the planes that actually get output to your monitor. Here's what I'm getting on an RTX 4090 / InnoCN 27M2V and Cooler Master Tempest GP27U. https://imgur.com/a/SCyyZWt https://imgur.com/a/SCyyZWt
EnPissant 9mo ago
I asked claude to investigate: Your Display Configuration Both monitors are outputting 10-bit color using the ABGR2101010 pixel format. | Monitor | Connector | Format | Color Depth | HDR | Colorspace | |------------------------|-----------|-------------|-------------|--------------|------------| | Dell U2725QE (XXXXXXX) | HDMI-A-1 | ABGR2101010 | 10-bit | Enabled (PQ) | BT2020_RGB | | Dell U2725QE (XXXXXXX) | HDMI-A-2 | ABGR2101010 | 10-bit | Disabled | Default | * Changed the serial numbers to XXXXXXX I am on Wayland and outputting via HDMI 2.1 if that helps. EDIT: Claude explained how it determined this with drm_info, and manually verified it: > Planes 0 and 3 are the primary planes (type=1) for CRTCs 62 and 81 respectively - these are what actually display your desktop content. The Format: field shows the pixel format of the currently attached framebuffer. EDIT: Also note that I am slowbanned on this site, so may not be able to respond for a bit. EDIT: You should try connecting with HDMI 2.1 (you will need a 8k HDMI cable or it will fall back to older standards instead of FRL). EDIT: HDR on youtube appears to work for me. Youtube correctly indentifies HDR on only 1 of my monitors and I can see a big difference in the flames between them on this scene: https://www.youtube.com/watch?v=WjJWvAhNq34 https://www.youtube.com/watch?v=WjJWvAhNq34
- bitanarch 9mo ago
  I don't have a Dell U2725QE, but on InnoCN 27M2V and Cooler Master GP27U there's no ABGR2101010 support. These monitors would only work with ARGB2101010 or XRGB2101010 which nVidia drivers do not provide. Here's what I'm getting on both monitors, with HDR enabled on Gnome 49: https://imgur.com/a/SCyyZWt https://imgur.com/a/SCyyZWt Maybe you're lucky with the Dell. But as I understand, HDR playback on Chrome is still broken.
  - wirybeige 9mo ago
    HDR playback in chrome on KDE works as expected from what I can tell. For GNOME 49.2 it does not, it doesn't get the luminance that it should at this time. 49.3 may fix this.
- bitanarch 9mo ago
  Ok. I've been using DisplayPort 1.4a with my 4090 at the moment. Maybe I'll try HDMI 2.1 and see what happens. I'm actually surprised that YouTube HDR works on your side - perhaps it's tied to the ABGR2101010 output mode being available.
  - bitanarch 9mo ago
    No luck for me with HDMI 2.1 - still seeing XRGB8888 on my monitors after HDR enabled. That's still pretty crappy. Monitors do not say whether they support BGR input signals or not as opposed to RGB.
    - EnPissant 9mo ago
      Was it an 8k cable? Are you on wayland?
      - bitanarch 9mo ago
        I'm on Wayland and the cable is HDMI 2.1 ultra high speed, which means 8k. Xorg is already gone on Ubuntu 25.10. The GPU and monitor combination has full 10-bit HDR in Windows. But in Linux it's stuck at 8bpp due to nVidia driver not having 10-bit RGB output.

EnPissant 9mo ago

It's not obvious how to interpret the output. I pasted it into chatgpt and it thinks I am using "Format: ABGR2101010" for both monitors (only 1 has HDR on) so I don't trust it. EDIT: See my sibling comment.

bitanarch 9mo ago
Under the Planes section, look for planes that have non-zero "CRTC_ID". Those are the planes that actually get output to your monitor. Here's what I'm getting on an RTX 4090 / InnoCN 27M2V and Cooler Master Tempest GP27U. https://imgur.com/a/SCyyZWt https://imgur.com/a/SCyyZWt

EnPissant 9mo ago

I asked claude to investigate: Your Display Configuration Both monitors are outputting 10-bit color using the ABGR2101010 pixel format. | Monitor | Connector | Format | Color Depth | HDR | Colorspace | |------------------------|-----------|-------------|-------------|--------------|------------| | Dell U2725QE (XXXXXXX) | HDMI-A-1 | ABGR2101010 | 10-bit | Enabled (PQ) | BT2020_RGB | | Dell U2725QE (XXXXXXX) | HDMI-A-2 | ABGR2101010 | 10-bit | Disabled | Default | * Changed the serial numbers to XXXXXXX I am on Wayland and outputting via HDMI 2.1 if that helps. EDIT: Claude explained how it determined this with drm_info, and manually verified it: > Planes 0 and 3 are the primary planes (type=1) for CRTCs 62 and 81 respectively - these are what actually display your desktop content. The Format: field shows the pixel format of the currently attached framebuffer. EDIT: Also note that I am slowbanned on this site, so may not be able to respond for a bit. EDIT: You should try connecting with HDMI 2.1 (you will need a 8k HDMI cable or it will fall back to older standards instead of FRL). EDIT: HDR on youtube appears to work for me. Youtube correctly indentifies HDR on only 1 of my monitors and I can see a big difference in the flames between them on this scene: https://www.youtube.com/watch?v=WjJWvAhNq34 https://www.youtube.com/watch?v=WjJWvAhNq34

bitanarch 9mo ago
I don't have a Dell U2725QE, but on InnoCN 27M2V and Cooler Master GP27U there's no ABGR2101010 support. These monitors would only work with ARGB2101010 or XRGB2101010 which nVidia drivers do not provide. Here's what I'm getting on both monitors, with HDR enabled on Gnome 49: https://imgur.com/a/SCyyZWt https://imgur.com/a/SCyyZWt Maybe you're lucky with the Dell. But as I understand, HDR playback on Chrome is still broken.
- wirybeige 9mo ago
  HDR playback in chrome on KDE works as expected from what I can tell. For GNOME 49.2 it does not, it doesn't get the luminance that it should at this time. 49.3 may fix this.
bitanarch 9mo ago
Ok. I've been using DisplayPort 1.4a with my 4090 at the moment. Maybe I'll try HDMI 2.1 and see what happens. I'm actually surprised that YouTube HDR works on your side - perhaps it's tied to the ABGR2101010 output mode being available.
- bitanarch 9mo ago
  No luck for me with HDMI 2.1 - still seeing XRGB8888 on my monitors after HDR enabled. That's still pretty crappy. Monitors do not say whether they support BGR input signals or not as opposed to RGB.
  - EnPissant 9mo ago
    Was it an 8k cable? Are you on wayland?
    - bitanarch 9mo ago
      I'm on Wayland and the cable is HDMI 2.1 ultra high speed, which means 8k. Xorg is already gone on Ubuntu 25.10. The GPU and monitor combination has full 10-bit HDR in Windows. But in Linux it's stuck at 8bpp due to nVidia driver not having 10-bit RGB output.