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How to Fix the “Local Adapter Does Not Support An Important Low Energy Controller State” Error on Windows

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If you’re getting a weird “Local Adapter Does Not Support An Important Low Energy Controller State” error message, here’s how to fix it.

closeup of a usb wifi adapter

Has an error related to your Local Adapter and a Low Energy Controller State shown up in your system? The error message usually reads, “the Local Adapter Does Not Support An Important Low Energy Controller State.” But what does this mean, and how do you fix it?

Let’s explore what causes this odd error, and what you can do to get your PC back to normal.

What Does the “Local Adapter Does Not Support An Important Low Energy Controller State” Error Mean?

screenshot of event viewer displaying an error

If you see this error pop up in your Event Viewer, chances are you’re using either a USB Wi-Fi adapter or some form of Bluetooth adapter. The error message is describing an issue when it comes to initiating a low energy, or power-saving, state.

At a basic level, it means that your adapter is trying to idle to save power, and isn’t able to.

How To Fix the “Local Adapter Does Not Support An Important Low Energy Controller State” Error

screenshot of uninstalling device from device manager

A quick troubleshooting method and a possible fix would be to refresh the drivers for your adapter. To do so in Windows 10 or 11, follow these steps:

  1. Open up the Start Menu and search Device Manager
  2. Navigate to the adapter in question
  3. Right-click and hit Uninstall Device

From here, simply reinsert your adapter, or, if it’s an internal device, restart your system. Windows will automatically apply the latest drivers and potentially fix your problem.

Related: How to Use the Device Manager to Troubleshoot Windows 10

Still Not Fixed? Other Solutions for This Error

altering power settings for a wifi device on windows device manager

Did refreshing the drivers not work? Don’t worry. If you haven’t fixed your problem at this point, there’s a good chance that this error is simply a misfiring of code, and there’s nothing to actually fix.

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Your adapter may be trying to enter a low-power state it doesn’t support. This means it’s fairly consequence-free to just ignore this warning.

Yellow triangles in the Event Viewer can be annoying, though, so if you’d like a solution for the error messages, follow these steps:

  1. Open up the Start Menu and search Device Manager
  2. Navigate to the adapter in question
  3. Right-click and hit Properties
  4. Keep an eye out for a Power Management tab. If it’s there, click into it
  5. Untick the box next to Allow the computer to turn off this device to save power

Hit OK and close Device Manager. Take a look at your Event Viewer logs, and you should see the error is gone.

Related: How to Fix Windows 10 Sleep Mode Issues

Cleaner Event Viewer Once More

With this quick fix done, you’ll have hopefully removed one more yellow triangle from your Event Viewer log. Issues like these can be annoying, but they’re usually nothing a quick driver refresh can’t fix.


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