@Steve : thanks for the link;

I just tried Device Control with the 2023 template; it is not working;
it seems that DC can read the settings (eg Brightness,...) of the picture mode the TV is already in, but DC can not change the picture mode or go into or out-of calibration;
when I connected DC to the TV the first time, as expected it was in Cinema (SDR) and it seemed to work but when I selected Expert Dark an error message came up (it seems to be always the same. Also when enabling/disabling calibration). I tried to switch forth and back between Cinema and Expert. Without success. The same message poped up when I toggeled calibration. Here the full message can be seen on the left bottom side of the screenshot.

so I closed DC, Firerfox and Pearl and started a fresh session. This time the chaos was even bigger: altought the PGenerator was displaying an SDR-Pattern and the TV was in Expert Dark, DC offered me only Dolby Picturemodes (see enableCal with the same error message).

error

enableCal

It is impossible for a G4 to lack calibration capabilities. There may be an issue with your TV, possibly due to poor quality control or another factor.

@ConnecTED - thanks, we will have to see how we convince the seller his product is defect... I had the slight hope that maybe with the newest FW something in the communication protocol was changed which you could fix...

to the original point: I have here two different G4-sets, one 77" one 65"; purchased from different sellers at different times; both are setup in the same way (see pictures; see also the next post) and both deliver with HDR-Cinema the same peak Luma of a little below 600 nits... how can that be? What is wrong with the settings? Or is there the possibility that for whatever reasons (energy conservation, hazard precaution,...) maxLuma is limited in certain legislations?

HDR_settings_01	HDR_settings_02	HDR_settings_03
HDR_settings_04	HDR_settings_05	HDR_settings_06
HDR_settings_07	HDR_settings_08

here the continuation of the settings an measurements.

HDR_settings_09	HDR_settings_10	HDR_settings_11
HDR_settings_12

cmal

Your Pgenerator is set to 4096x2160 resolution, while the G4's native resolution is 3840x2160. Have you tried changing the resolution to something the display is capable of to see if it resolves your issue?

cmal

Do you use the HDMI-A1 port of your Pi?

If you set Peak Brightness OFF, how many nits do you get?

Disable the intelligent integrator for your meter and use 3 3-second integration time.

If you have an incorrect input signal on the HDMI input, or incorrect colour space settings, etc., that can cause the "Could not select desired picture mode" error message.

Steve

thanks to all;
I will try this; it is a 1h drive to my friend ant he is not always available; so, it might take a few days... thanks!
and yes, I'm on HDM1 1 of the RPi (it is the one close to the USB-C port);

ok, I'm writing this now the second time because the first post ended in nirvana after clicking "Post message..." (there is an instability in this Forum Software; annoying)...

I had today the chance to work with the TV again:
I set the resolution to 3840x2160: still no calibration mode (neither with CS nor with DC; DC presents with SDR Rec 709 only DoVi-modes!);
but (!) all of a sudden HDR-Cinema gave me ~1480 nits; it is reproducible: going back to 4096x2160 I get again 580 nits;
the interesting/confusing part is that the LG-Level-2-Support confirmed 600-700 nits (its German but can be translated):
"Der OLED65G45LW erreicht in der Regel eine Spitzenhelligkeit von etwa 600 bis 700 Nits in einem 10 %-Fenster im HDR-Kinomodus."

I'm convinced that there is a miscommunication between CS and the TV (also within the LG-Menues there is confusion: sometimes they talk about "signal level", sometimes about "code values"; there is also a for me new menue item "show brightness level at the..."):
there is a discrepancy between the LG and CS; when I go to the LG, the lowest Code Value is "116"; when I check the "2023 HDR 10bit" patch list then the lowest patch code value is "17"; The highest value is in both cases "1023";
if I look into the Interactive User Menue the lowest value is "2,5 IRE" and it shows RGB settings far from "0"; they seem to be what I tried to do with "2-Point-Low" to improve EOTF. At the same time the TV settings show for the lowest level (116) RGB of 0/0/0...
does "Code Value 17" of the patch list or "2,5 IRE" of the User Interface represent "Code Value 116" of the TV? Is the 2023-patch-list suitable for the 2024?
the complete Code Value list of the LG: 1023, 872, 835, 806, 776, 752, 730, 706, 685, 664, 642, 617, 588, 557, 523, 481, 435, 375, 298, 253, 191, 116.
when I connect CS to the TV it is reported as "OLED65G4 2 LW". I that really the same as the "OLED65G4 5 LW" I'm talking about?

While the RGB-balance seems to be "ok", I have significant trouble to correct EOTF. It is not recommanded to "adjust luminance". Instead one should change RGB simultaneously. Is that still valid?
Thanks for any tips or improvements.

Code Level 17	Code Level 116 - RGB	EOTF
Luminance

The bit values provided for the HDR10 white balance control points in LG menus are based on full range 10 bit (0-1023). In order properly calibrate HDR10 manually while in gamma space you need the 10 bit limited range values which correspond to the control points.
From my understanding, the 2024 models use different bit values than those of the prior years.
A G4 owner has mapped the HDR10 control points in limited range on another forum and posted the corresponding bit values:
https://www.avsforum.com/posts/63871708/
You may want to try creating a patch set based on those values to see if you have better luck.

Since you can't enable calibration in HDR, the HDR processing is not disabled, so you can't use any of those patchlists.

You can't calibrate for gamma with enabled HDR processing.

It looks like your TV is broken; since it's outputting 700 nits one day and 1400 the other day, the Alpha chipset of your TV has calibration functions.

The DoVi calibration can be performed because the metadata inside the DoVi signal can disable the TV processing so you can calibrate at the gamma level.

@ConnecTED
it's not "one day 700" and "the other 1400 nits". Its at 4096x2160 ~580 nits and at 3840x2160 ~1500 nits with HDR-Cinema.
But calibration can not be initiated with any mode (SDR nor HDR). And Device Control is showing only DoVi-Modes although I'm selecting and sending SDR-Modes with PGenerator... !
I that means DC / CS and the TV are not talking the same language !
(am not talking about DoVi-Calibration because I have not even managed SDR...)

cmal

It looks like your TV model has disabled calibration capabilities.

It has happened again with some EU models; Calman is not working with those TVs either.

Check:

https://lightillusion.com/forums/msg.php?id=7767

https://lightillusion.com/forums/msg.php?id=8225

@titleexaminer92
thank you for the link; I have made a patch list

@ConnecTED
I hope that is not the last word; after all I have also asked the level-2-support this question and he confirmed that my model is suitable for calibration (again the original Q/A in German):
"...
1. Ist dieses Modell im SDR-Modus über 3D-LUT (z.B. isf Expert Dark) mit ColourSpace kalibrierbar?
Ja, das LG OLED65G45LW unterstützt die 3D-LUT-Kalibrierung für SDR-Modi.

LG-Fernseher dieser Serie ermöglichen in der Regel erweiterte Kalibrierungs-Workflows, einschließlich 3D-LUT-Profilierung, mit professioneller Software wie ColourSpace.
Der Fernseher bietet die Modi ISF Expert Dark und Expert Bright, die kalibrierfreundlich sind.
Sie können benutzerdefinierte 3D-LUTs über das Service-Menü oder über USB (abhängig von der genauen Firmware und Modellregion) hochladen, was eine präzise Farbabstimmung ermöglicht.
..."

I told him that my device refuses to activate the calibration mode (with a screenshot) which prevents a real profiling of the TV-set. And since he mentioned in his answer the Service Menue, I asked whether there is a setting within the SM or elsewhere which would allow to circumvent the problem. But I do not have an answer yet...

Google Transalation
1. Is this model calibrated in SDR mode using a 3D LUT (e.g., ISF Expert Dark) with ColourSpace?
Yes, the LG OLED65G45LW supports 3D LUT calibration for SDR modes.

LG TVs in this series typically enable advanced calibration workflows, including 3D LUT profiling, with professional software such as ColourSpace.
The TV offers ISF Expert Dark and Expert Bright modes, which are easy to calibrate.
You can upload custom 3D LUTs via the service menu or via USB (depending on the exact firmware and model region), allowing for precise color matching.

The fact the support person says "You can upload custom 3D LUTs via the service menu or via USB (depending on the exact firmware and model region), allowing for precise color matching." means he has no idea what he is talking about...

Steve