Fix “new_disprd failed” Error in DisplayCAL You click “Calibrate and profile”, the instrument initializes, and DisplayCAL aborts with an error mentioning new_disprd failed. This error comes from dispread, the ArgyllCMS tool DisplayCAL uses to take measurements. It means ArgyllCMS could not open a working communication channel to your colorimeter. The measurement never started, so your…
DisplayCAL on Wayland: What Works and What Doesn’t Running Linux with Wayland and wondering why DisplayCAL behaves strangely? You are not alone. GitHub issue #133 (“wayland no access to video card gamma table”) has been open since 2022 and explains the fundamental limitation. The Core Problem DisplayCAL’s calibration step loads correction curves into the video…
DisplayCAL Not Detecting Your Colorimeter? 8 Fixes DisplayCAL shows “no instrument detected” even though your colorimeter is plugged in. Before you assume the hardware is dead, work through these fixes. They come from real user reports, including GitHub issue #304, where an i1 Display Plus HL was invisible to the software. Fix 1. Install the…
DisplayCAL White Point Wrong? 6500K Measures as 6400K You set the white point target to 6500K (D65). You run the calibration. The measurement report comes back: 6400K, for both target and result. You try “as measured”, you try manual 6500K, you re-measure. Still 6400K. This exact behavior was reported in GitHub issue #411. The Reported…
DisplayCAL Profile Not Applied After Reboot (macOS Fix) You calibrate your display, the profile applies perfectly, then you log out, reboot, log back in, and your calibration is gone. The screen looks uncalibrated again. This is a real, confirmed bug in DisplayCAL-py3 on macOS, reported as GitHub issue #392. Symptoms The pattern from the issue…
