Re: HDR Support in KDE

Stephen Morris via users Wed, 16 Oct 2024 05:28:48 -0700

On 16/10/24 20:51, Barry Scott wrote:

On 15 Oct 2024, at 11:44, Barry Scott <ba...@barrys-emacs.org> wrote:
When I get a moment o investigate I will have a look at EDID and see if there is where the HDR info if returned from the monitor. I have not looked at that level of details yet, so things to learn about.
I think I have found the HDR setting in EDID.

From `kscreen-doctor -o` you can get the name of your output.
Using that name you can get the edid for the screen.

On my desktop I see this (edited for brevity).
The output is named DP-2.

The HDR I think is indicated by the "Bits per primary color channel: 10"

What is the EDID for your monitor report?

For me it does show that info.

kscreen-doctor -o

Qt: Session management error: Authentication Rejected, reason : MIT-MAGIC-COOKIE-1 authentication rejected

Output: 445 HDMI-0
enabled
connected
priority 1
HDMI

Modes: 446:3840x2160@60*! 447:3840x2160@60 448:3840x2160@50 449:3840x2160@30 450:3840x2160@25 451:3840x2160@24 452:3840x2160@24 453:2560x1440@60 454:1920x1080@60 455:1920x1080@60 456:1920x1080@50 457:1920x1080@30 458:1920x1080@25 459:1 920x1080@24 460:1680x1050@60 461:1600x1200@60 462:1600x900@60 463:1440x480@60 464:1280x1024@75 465:1280x1024@60 466:1280x800@60 467:1280x720@60 468:1280x720@60 469:1280x720@50 470:1024x768@75 471:1024x768@60 472:800x600@75 473:800x600@60 474:

720x576@50  475:720x480@60  476:640x480@75  477:640x480@60  478:640x480@60
Geometry: 0,0 3840x2160
Scale: 1
Rotation: 1
Overscan: 0
Vrr: incapable
RgbRange: unknown
HDR: incapable
Wide Color Gamut: incapable
ICC profile: incapable
Color profile source: incapable
Brightness control: unsupported


edid-decode /sys/class/drm/card1/card1-HDMI-A-1/edid

Block 0, Base EDID:
 EDID Structure Version & Revision: 1.3
 Vendor & Product Identification:
   Manufacturer: BNQ
   Model: 31049
   Serial Number: 21573 (0x00005445)
   Made in: week 24 of 2018
 Basic Display Parameters & Features:
   Digital display
   Maximum image size: 62 cm x 34 cm
   Gamma: 2.20
   DPMS levels: Off
   RGB color display
   Default (sRGB) color space is primary color space
   First detailed timing is the preferred timing
 Color Characteristics:
   Red  : 0.6328, 0.3398
   Green: 0.3105, 0.6328
   Blue : 0.1582, 0.0605
   White: 0.3134, 0.3291
Detailed Timing Descriptors:

DTD 1: 3840x2160 60.001125 Hz 16:9 133.322 kHz 533.290000 MHz (621 mm x 341 mm)

                Hfront   48 Hsync  32 Hback   80 Hpol P
                Vfront    3 Vsync   5 Vback   54 Vpol N
   Display Product Serial Number: 'K6J00761SL0'
   Display Range Limits:
     Monitor ranges (GTF): 24-76 Hz V, 30-135 kHz H, max dotclock 600 MHz
   Display Product Name: 'BenQ EL2870U'
 Extension blocks: 1

Block 1, CTA-861 Extension Block:
HDR Static Metadata Data Block:
   Electro optical transfer functions:
     Traditional gamma - SDR luminance range
     SMPTE ST2084
   Supported static metadata descriptors:
     Static metadata type 1
   Desired content max luminance: 90 (351.250 cd/m^2)
   Desired content max frame-average luminance: 83 (301.833 cd/m^2)
   Desired content min luminance: 68 (0.250 cd/m^2)


regards,
Steve


Barry

```
+ kscreen-doctor -o
Output: 1 DP-2
        enabled
        connected
        priority 1
        DisplayPort

Modes: 1:3840x2160@60*! 2:3840x2160@30 3:2560x1440@60 4:2048x1280@60 5:2048x1152@60 6:1920x1200@60 7:204←

        Geometry: 0,0 3072x1728
        Scale: 1.25
        Rotation: 1
        Overscan: 0
        Vrr: incapable
        RgbRange: unknown
        HDR: enabled
...
+ edid-decode /sys/class/drm/card1/card1-DP-2/device/card1-DP-2/edid
...
Block 0, Base EDID:
  EDID Structure Version & Revision: 1.4
  Vendor & Product Identification:
    Manufacturer: DEL
    Model: 17011
    Serial Number: 1094015308 (0x4135594c)
    Made in: week 23 of 2022
  Basic Display Parameters & Features:
    Digital display
    Bits per primary color channel: 10
    DisplayPort interface
    Maximum image size: 70 cm x 39 cm
    Gamma: 2.20
...
```

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Re: HDR Support in KDE

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