#30018 (Bug) Unable to Calibrate LG38GL950-B using i1 Display Pro due to error – Your graphics drivers or hardware do not support loadable gamma ramps or calibration. You may need to update your device drivers.

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New
Component: DisplayCAL 3.8.9.3
Created by NickLaPalomento

Last modified


Purchased an i1 Display Pro to calibrate my LG38GL950-B. After installing DisplayCal 3.8.9.3 I receive the following error after clicking “Calibrate & Profile”:

“Your graphics drivers or hardware do not support loadable gamma ramps or calibration. You may need to update your device drivers.”

I pulled up the log and see the following error which I assume is the problem:

11:33:47,204 Checking video card gamma table access for display 1…
11:33:47,242 Dispwin: Error – We don’t have access to the VideoLUT
11:33:47,275 Dispwin: Error – We don’t have access to the VideoLUT for clearing
11:33:47,305 Dispwin: Error – We don’t have access to the VideoLUT for loading
11:33:47,335 Dispwin: Error – We don’t have access to the VideoLUT for clearing

I’m running on the latest available Windows 10 Pro Version 20H2 Build 19042.964 with a Nvidia Geforce RTX 3080 on the latest 466.27 game-ready driver.

Attempted troubleshooting:

  • I tried to patch the latest build of ArgyllCMS by downloading the current version 2.2.0 and overwriting the files in the AppData\Roaming\DisplayCAL\dl\Argyll_V2.1.2\bin folder with the ones from the new version. —-> Same error
  • I uninstalled and re-installed DisplayCal then rebooted the computer—> Same error
  • I performed a clean install of the latest nvidia game-ready driver then rebooted the computer—> Same error

Any idea how I can get it working, or do I need to wait for a new version of DisplayCal and/or AgyllCMS?

LOG FILE:

11:33:43,094 DisplayCAL.exe 3.8.9.3 2019-12-14T12:19:18.994Z
11:33:43,098 Windows 10 Pro Version 2009 Build 19042.964 x86_64
11:33:43,098 Python 2.7.16 (v2.7.16:413a49145e, Mar 4 2019, 01:30:55) [MSC v.1500 32 bit ↲
↳ (Intel)]
11:33:43,098 CA file C:\Program Files (x86)\DisplayCAL\cacert.pem
11:33:43,098 Faulthandler 3.2
11:33:43,150 wxPython 4.0.6 msw (phoenix) wxWidgets 3.0.5
11:33:43,150 Encoding: cp437
11:33:43,151 File system encoding: mbcs
11:33:43,151 Loading C:\Users\nick_000\AppData\Roaming\DisplayCAL\DisplayCAL.ini
11:33:43,151 Lockfile C:\Users\nick_000\AppData\Roaming\DisplayCAL\DisplayCAL-apply- ↲
↳ profiles.lock
11:33:43,151 Existing client using port 15411
11:33:43,151 Lockfile C:\Users\nick_000\AppData\Roaming\DisplayCAL\DisplayCAL.lock
11:33:43,273 Imported existing <module ‘comtypes.gen’ from ‘C:\Program Files ↲
↳ (x86)\DisplayCAL\lib\library.zip\comtypes\gen\__init__.pyc’>
11:33:43,276 Using writeable comtypes cache directory: ↲
↳ ‘c:\users\nick_000\appdata\local\temp\comtypes_cache\DisplayCAL-27’
11:33:43,395 Starting up…
11:33:43,499 Audio module: pyglet 1.2.2
11:33:45,233 Enumerating display devices and communication ports…
11:33:45,233 C:\Users\nick_000\AppData\Roaming\DisplayCAL\dl\Argyll_V2.1.2\bin
11:33:47,203 ArgyllCMS 2.2.0
11:33:47,203 Argyll has virtual display support
11:33:47,203 …ok.
11:33:47,204 Checking video card gamma table access for display 1…
11:33:47,242 Dispwin: Error – We don’t have access to the VideoLUT
11:33:47,275 Dispwin: Error – We don’t have access to the VideoLUT for clearing
11:33:47,305 Dispwin: Error – We don’t have access to the VideoLUT for loading
11:33:47,335 Dispwin: Error – We don’t have access to the VideoLUT for clearing
11:33:47,335 …failed!
11:33:47,335 Initializing GUI…
11:33:47,703
11:33:49,326 …ok.
11:33:49,328 Ready.
11:33:49,598 Setting up scripting host at 127.0.0.1:57068
11:33:49,763 Check for application update…
11:33:50,125 DisplayCAL is up-to-date.
11:33:50,476 ArgyllCMS is up-to-date.
11:33:53,005 ┌——————————————————————————┐
11:33:53,005 │ Your graphics drivers or hardware do not support loadable gamma ramps or │
11:33:53,005 │ calibration. You may need to update your device drivers. │
11:33:53,005 └——————————————————————————┘
11:35:13,799 Resetting video card gamma table to linear…
11:35:13,829 Dispwin: Error – We don’t have access to the VideoLUT for clearing
11:35:13,829 About to open dispwin object on the display
11:35:13,831 …failed!
11:35:15,900 ┌——————————————————————————┐
11:35:15,900 │ Your graphics drivers or hardware do not support loadable gamma ramps or │
11:35:15,901 │ calibration. You may need to update your device drivers. │
11:35:15,901 └——————————————————————————┘


One comment on “Unable to Calibrate LG38GL950-B using i1 Display Pro due to error – Your graphics drivers or hardware do not support loadable gamma ramps or calibration. You may need to update your device drivers.”

  1. Issue Solved! Here’s what I did in case someone finds it usefulI looked at Device Manager and under “Monitors” found “Generic PnP Monitor”.When I looked at the properties the driver said the provider was “Teamviewer”.I opened Color Management via Control Panel and there was no monitor listed in the dropdown.I went back to Device Manager and uninstalled the monitor driver, then ran “Scan for Hardware Changes” and the monitor showed up again.I checked the properties and under the driver tab it now says the driver provider is “Microsoft”.I closed and restarted Color Management and now there is a display listed under devices labeled “Display 1: Generic PnP Monitor – Nvidia Geforce RTX 3080”.I Launched DisplayCal and clicked “Tools/Detect Display Devices and Instruments”. I clicked “Calibrate & profile” and this time it worked without errorHopefully this is helpful for someone else!

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