Re: HDR Support in KDE

[Barry Scott <barry@xxxxxxxxxxxxxxxx>]

On 16 Oct 2024, at 13:28, Stephen Morris <samorris@xxxxxxxxxxxxxxx> wrote:

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

For me it does show that info.


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

 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

I left off one section of my EDID sorry for not noticing it. It's on the end of this email.

Your Basic display Parameters is missing the bits per color I have in my EDID.

I wonder if that is what is being checked for? HDR needs 10 bits.

Best to ask KDE developers for help with the info we have at this point.

You could use the kde bug tracker https://bugs.kde.org/ or the kde discuss forum https://discuss.kde.org

Barry

 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)

Block 1, CTA-861 Extension Block:

  Revision: 3

  Underscans IT Video Formats by default

  Basic audio support

  Supports YCbCr 4:4:4

  Supports YCbCr 4:2:2

  Native detailed modes: 1

  Video Data Block:

    VIC  16:  1920x1080   60.000000 Hz  16:9     67.500 kHz    148.500000 MHz

    VIC  31:  1920x1080   50.000000 Hz  16:9     56.250 kHz    148.500000 MHz

    VIC  32:  1920x1080   24.000000 Hz  16:9     27.000 kHz     74.250000 MHz

    VIC   4:  1280x720    60.000000 Hz  16:9     45.000 kHz     74.250000 MHz

    VIC  19:  1280x720    50.000000 Hz  16:9     37.500 kHz     74.250000 MHz

    VIC  18:   720x576    50.000000 Hz  16:9     31.250 kHz     27.000000 MHz

    VIC  17:   720x576    50.000000 Hz   4:3     31.250 kHz     27.000000 MHz

    VIC   3:   720x480    59.940060 Hz  16:9     31.469 kHz     27.000000 MHz

    VIC   2:   720x480    59.940060 Hz   4:3     31.469 kHz     27.000000 MHz

    VIC   1:   640x480    59.940476 Hz   4:3     31.469 kHz     25.175000 MHz

  Audio Data Block:

    Linear PCM:

      Max channels: 2

      Supported sample rates (kHz): 48 44.1 32

      Supported sample sizes (bits): 24 20 16

  Speaker Allocation Data Block:

    FL/FR - Front Left/Right

  Colorimetry Data Block:

    BT2020YCC

    BT2020RGB

  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: 98 (417.710 cd/m^2)

    Desired content max frame-average luminance: 98 (417.710 cd/m^2)

    Desired content min luminance: 56 (0.201 cd/m^2)

  Detailed Timing Descriptors:

    DTD 2:  3840x2160   29.980602 Hz  16:9     65.688 kHz    262.750000 MHz (698 mm x 393 mm)

                 Hfront   48 Hsync  32 Hback   80 Hpol P

                 Vfront    3 Vsync   5 Vback   23 Vpol N

    DTD 3:  2560x1440   59.950550 Hz  16:9     88.787 kHz    241.500000 MHz (698 mm x 393 mm)

                 Hfront   48 Hsync  32 Hback   80 Hpol P

                 Vfront    3 Vsync   5 Vback   33 Vpol N

    DTD 4:  2048x1280   60.196470 Hz  16:10    78.918 kHz    174.250000 MHz (698 mm x 393 mm)

                 Hfront   48 Hsync  32 Hback   80 Hpol P

                 Vfront    3 Vsync   6 Vback   22 Vpol N

    DTD 5:  2048x1080   23.996617 Hz 256:135   26.372 kHz     58.230000 MHz (698 mm x 393 mm)

                 Hfront   48 Hsync  32 Hback   80 Hpol P

                 Vfront    3 Vsync  10 Vback    6 Vpol N

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