Re: HDR Support in KDE

[Stephen Morris via users <users@xxxxxxxxxxxxxxxxxxxxxxx>]

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

On 15 Oct 2024, at 11:44, Barry Scott <barry@xxxxxxxxxxxxxxxx> 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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