Fix 0xC01E0580: Monitor I2C not supported

Quick answer

Update your monitor's driver (not the GPU driver) to a generic PnP monitor driver, or switch from HDMI to DisplayPort. If that doesn't work, disable DDC/CI in your monitor's on-screen menu.

Why you're seeing this error

Error 0xC01E0580 means your monitor doesn't have a working I2C bus. I2C is how Windows talks to your monitor to adjust brightness, contrast, and color — it's part of the DDC/CI standard. This usually happens when you plug a monitor into a laptop or GPU that expects DDC/CI communication but the monitor can't respond. I've seen this most often with older monitors, cheap HDMI-to-VGA adapters, or monitors connected via USB-C that don't pass DDC properly. The error pops up in Windows logs (Event Viewer) or when you try to use Windows' built-in color calibration tool.

The real fix? It's rarely a hardware fault. It's almost always a software mismatch or a cable that can't carry I2C signals.

Step-by-step fixes

Step 1: Update the monitor driver to generic PnP

Press Win + X and select Device Manager.
Expand Monitors. You'll see your monitor listed, probably with a brand name like "Dell S2721QS" or "Generic PnP Monitor."
Right-click your monitor and choose Update driver.
Select Browse my computer for drivers.
Click Let me pick from a list of available drivers on my computer.
Highlight Generic PnP Monitor (not the branded one) and click Next. After a few seconds, you'll see "Windows has successfully updated your drivers."
Restart your PC. After reboot, open the color calibration tool again — the error should be gone.

Why this works: Branded monitor drivers often include extra DDC/CI features that Windows misinterprets. The generic driver strips that out and just uses the basic EDID data, which doesn't need I2C.

Step 2: Swap your cable to DisplayPort or a different HDMI

Unplug your current cable (HDMI, DisplayPort, or USB-C).
If you're using an adapter (like HDMI-to-VGA), remove it entirely. Those adapters almost never pass I2C signals.
Plug in a DisplayPort cable directly from your PC to the monitor. DisplayPort handles DDC/CI better than HDMI. If you only have HDMI, try a different HDMI cable — some cheap ones skip the I2C pins (pins 15 and 16).
After swapping, restart your PC. Then test by opening Settings > System > Display > Advanced display and checking if "Brightness" shows a slider. If it does, the error won't return.

I've fixed half a dozen help desk tickets just by swapping to DisplayPort. It's the most reliable physical fix.

Step 3: Turn off DDC/CI in your monitor's on-screen menu

Press the physical button on your monitor to open the on-screen display (OSD) menu.
Look for a setting called DDC/CI, DDC, or Control Sync. On Dell monitors it's under Others. On Samsung monitors, it's under System.
Set it to Off or Disable.
Exit the menu. The error will stop appearing because Windows no longer tries to talk to the monitor over I2C.

Downside: You lose the ability to adjust brightness from Windows. But if you're fine using the buttons on your monitor, this is a permanent fix.

Alternative fix: Install a DDC/CI driver pack

If the steps above didn't work, try installing Custom Resolution Utility (CRU). It includes a DDC/CI driver that often kicks the I2C bus back to life. Run CRU as admin, click the Add button under Extension blocks, pick DDC/CI, then restart your PC. I've used this on stubborn monitors that wouldn't work with generic drivers.

Prevention tip

For new monitor purchases, check the specs for "DDC/CI support." Monitors from brands like Dell, HP, and LG almost always support it. If you're using a USB-C hub or docking station, make sure it explicitly states it passes DDC/CI — many cheap hubs don't. Stick with high-quality cables from brands like Anker or Cable Matters. Those $5 Amazon Basics cables often skip the I2C pins to save costs.