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?
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
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:
Open up the Start Menu and search Device Manager Navigate to the adapter in question 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.
Still Not Fixed? Other Solutions for This Error
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.
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:
Open up the Start Menu and search Device Manager Navigate to the adapter in question Right-click and hit Properties Keep an eye out for a Power Management tab. If it’s there, click into it 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.
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.
