HDR calibration gone?

[abner]

In the new Plasma 6.7, the “Calibrate HDR” option no longer appears in the Display Configuration menu, I only see the option to use an ICC/ICM color profile.

How should I now calibrate HDR manually, specifically the SDR reference white / paper-white level and the HDR peak luminance?

Using the internal ICC profile is not optimal for my monitor, an AOC CQ32G4E, which has very poor HDR out of the box, and I would like to know whether these values can still be adjusted through the GUI or if they now need to be configured through the terminal/CLI.

[Breemer]

I have this problem as well. I have a dual monitor setup, both identical monitors. Primary monitor does not show the calibrate button, secondary monitor still does

[Krovikan]

Question. Maybe the HDR calibration appears in a display with HDMI or DP and the other display is in other type of conecction? i.e. One monitor in HDMI and the other in DP.

Same question for @abner .

Regards

[abner]

Both monitors are connected via DP. The secondary monitor does not support HDR, so I cannot compare its behavior. Also, I don’t have an HDMI cable available to test whether the brightness controls appear when using HDMI.

I tested multiple refresh rates and resolutions, ranging from 720p to 1440p and 60 Hz to 180 Hz, but the issue persists.

this is what Kscreen-doctor -o sees (simplified):

Output: 1 DP-4 e44e6f99-f52d-4752-b68a-6cfb3161fd0f
Custom modes: None
Geometry: 0,0 2560x1440
Scale: 1
Rotation: 1
Overscan: 0
Vrr: Automatic
RgbRange: unknown
HDR: enabled
SDR brightness: 203 nits
SDR gamut wideness: 0%
Peak brightness: 418 nits, overridden with: 418 nits
Max average brightness: 418 nits
Min brightness: 0 nits
HDR color profile source: EDID
HDR ICC profile: /home/abner/Documentos/ICM Profiles/AOC CQ32G4/CQ32G4-fábrica.icm
Wide Color Gamut: enabled
ICC profile: /home/abner/Documentos/ICM Profiles/AOC CQ32G4/AOC CQ32G4VE.icm
Color profile source: ICC
Color power preference: prefer accuracy
Brightness control: supported, set to 100% and dimming to 100%
DDC/CI: allowed
Color resolution: unknown
Allow EDR: unsupported
Sharpness control: unsupported
Automatic brightness: unsupported
Auto Rotate Policy: incapable
Adaptive backlight modulation: unsupported

One thing I just noticed while writing this, is that is also pointing to the wrong Color Profile, even though Display Configuration is supposed to be using the “Built-in” profile:

Besides the HDR brightness controls disappearing, Plasma appears to ignore the selected “Color Profile” setting whenever an ICC/ICM file is assigned to the display. Even if I explicitly switch the profile source back to “Built-in” in Display Configuration, KScreenDoctor still reports that the ICC profile file is being used and colors are a bit wrong in HDR.

The only way I have found to actually make Plasma use the monitor’s built-in profile is to manually remove the assigned ICC/ICM file. After doing so, the display falls back to the built-in profile and HDR colors appears to improve:

   **HDR:** enabled 
            **SDR brightness:** 203 nits 
            **SDR gamut wideness:** 0% 
            **Peak brightness:** 418 nits**, overridden with:** 418 nits 
            **Max average brightness:** 418 nits 
            **Min brightness:** 0 nits 
            **HDR color profile source:** EDID 
            ***`HDR ICC profile:`** `none`*

However, I still cannot adjust the HDR peak brightness or SDR white point, so the main issue persists.

At this point, it looks like there may be two related issues in the HDR/color-management pipeline:

1. Plasma appears to keep using the assigned ICC/ICM file even when “Built-in” is selected in Display Configuration.
2. The HDR calibration controls are not available in the menu.

[Breemer]

For what it’s worth. I disabled HDR, removed the ICC profile for SDR, then enabled HDR and the ICC profile again and the button came back for me.

[abner]

I just tested it and it worked for me too. Removing the ICC profile from SDR makes the “Calibrate HDR” button reappear, so there’s definitely something wrong with the color profile/color management.

[Krovikan]

In Plasma 6.6.5 don’t exists ICC profile:

If someday, I update Plasma to 6.7 and I have this problem: what are the steps (commands or anything) to delete the ICC profile to solve the issue?

Regards

[abner]

Easy steps:

1. Disable HDR;
2. on “Color Profile” change it to “none”:
3. Enable HDR - The “Calibrate HDR” option should now appear.

Note: Make sure the “Color Profile” stays on “Built-in” with HDR Enable:

If the issue persists:

1. Disable HDR again;
2. Remove any manually assigned ICC/ICM profile:
3. Re-enable HDR and verify that no ICC profile is assigned to the display.

[Krovikan]

Thanks. Added the post to my favourites.

Regards

[Krovikan]

In plasma 6.7.1 I can see well the HDR calibration and now I have the line for ICC (in my case I can choose between ICC or integrated).

Regards