WiFi disconnection upon plugging in power on a Milennovo Yoga running Windows 11 Home is often caused by aggressive power management settings or driver conflicts. This guide provides concrete steps to adjust adapter properties and update drivers, ensuring stable connectivity without relying on unverified hardware theories.
Understanding the Power State Transition
When you connect your AC adapter, the laptop transitions from battery power to mains power. During this switch, Windows 11 may attempt to optimize performance or change power states for various components, including the network interface card (NIC). If the WiFi adapter is configured to save power aggressively, it might enter a low-power state that fails to re-establish connection properly when the system voltage stabilizes. Alternatively, the sudden surge in available power can trigger background processes or driver updates that temporarily interrupt the network stack.
This behavior is not necessarily indicative of electromagnetic interference (EMI) from the charger, although that is a possibility with cheap third-party adapters. However, before assuming hardware faults, it is crucial to address the software configuration that controls how the operating system handles the WiFi adapter during power state changes. The most common culprit is the "Allow the computer to turn off this device to save power" setting within the Device Manager.
For users experiencing broader network instability, such as issues with remote desktop connections or wired networks, checking the general network adapter health is also recommended. You can find more details on general troubleshooting in our guide on
How to Troubleshoot Windows 11 Laptop Connection to Specific WiFi Network without Internet Access.
Adjusting WiFi Adapter Power Settings
The first and most effective step is to disable power-saving features specifically for your WiFi adapter. This forces Windows to keep the adapter active regardless of the power source.
- Right-click the Start button and select Device Manager.
- Expand the Network adapters section.
- Locate your WiFi adapter. It will typically include names like Intel Wi-Fi, Realtek RTL8822CE, or MediaTek Wi-Fi.
- Right-click the adapter and select Properties.
- Navigate to the Power Management tab. If this tab is missing, skip to the next section.
- Uncheck the box that says Allow the computer to turn off this device to save power.
- Click OK and restart your laptop to apply the changes.
After restarting, test the connection by unplugging and replugging the power cord. If the issue persists, proceed to check the advanced properties of the adapter itself.
Advanced Performance Settings
Some adapters have additional settings under the
Advanced tab in the Properties window. Look for options related to:
- Roaming Aggressiveness: Set this to Medium or Highest. Low settings may cause the adapter to disconnect prematurely if it detects even minor signal fluctuations during power transitions.
- Throughput Booster: If present, ensure this is enabled or set to maximum performance. Note that some older drivers may have bugs with this feature; if issues start after enabling it, try disabling it instead.
- Energy Efficient Ethernet: Disable this if available. It can sometimes interfere with standard TCP/IP handshakes during rapid power state changes.
Updating and Rolling Back Drivers
Outdated or corrupted drivers are a frequent cause of intermittent connectivity. Windows Update may have installed a generic driver that does not fully support the specific power management features of your Milennovo Yoga's hardware.
Visit the manufacturer’s support website or use the built-in Windows Update mechanism to get the latest driver. In Device Manager, right-click the WiFi adapter and select
Update driver, then choose
Search automatically for drivers.
If you recently updated the driver and the problem started, you may need to roll back. Select
Properties, go to the
Driver tab, and click
Roll Back Driver if the button is active. This reverts to the previous version which may handle power transitions more gracefully.
For cases where driver corruption leads to severe system crashes alongside WiFi issues, refer to our comprehensive guide on
Laptop BSOD Caused by WiFi Adapter: Troubleshooting Guide.
Checking Chipset and BIOS Updates
The interaction between the CPU, chipset, and peripherals is managed by the BIOS/UEFI firmware. An outdated BIOS may contain bugs related to power delivery or PCIe lane initialization, which can affect the WiFi card's stability when switching power sources.
Check for BIOS updates through the Lenovo/Milennovo support portal or the pre-installed utility software on your laptop. Ensure you install these updates while connected to power but with no other critical tasks running. Always read the release notes to see if the update addresses "Wi-Fi stability" or "power management" issues.
Additionally, ensure your Windows 11 Home installation is fully updated. Go to
Settings >
Windows Update and install any pending cumulative updates. Microsoft frequently releases patches that fix network stack inconsistencies in recent builds.
Hardware and Environmental Factors
If software fixes fail, consider the physical environment. Using a non-OEM charger with poor shielding can introduce electrical noise into the power circuit, which may couple into the WiFi antenna lines if they run close together internally. Try using the original charger that came with the Milennovo Yoga.
Also, ensure that the WiFi antenna cables inside the laptop are securely connected. A loose antenna cable can cause intermittent drops that seem correlated with power events due to thermal expansion or vibration. This is less common but worth investigating if all software solutions are exhausted.
Frequently Asked Questions
Why does WiFi disconnect only when I plug in the charger?
The disconnection occurs because the system undergoes a power state transition, triggering power management routines or driver resets. Windows may aggressively turn off the adapter to save power initially, or the sudden availability of mains power causes the network stack to re-initialize, leading to a brief drop in connectivity.
Can a faulty charger cause WiFi issues?
Yes, a charger with inadequate shielding or poor quality control can introduce electromagnetic interference (EMI) into the laptop's power rails. This noise can disrupt sensitive wireless components if the internal grounding is insufficient. Using an OEM-certified charger helps eliminate this variable.
What should I do if the Power Management tab is missing?
If the tab is missing, the driver may be a generic Microsoft driver or an older version that does not expose these settings. Updating the driver from the manufacturer's website usually restores this tab. Alternatively, check the Advanced tab for similar power-related options.
Does disabling power saving reduce battery life?
Disabling the "turn off device" setting prevents the adapter from entering deep sleep modes, which may slightly increase battery drain during idle periods. However, the impact is usually minimal compared to the inconvenience of losing internet access. The trade-off is generally worth it for consistent connectivity.
How do I know if my WiFi driver is corrupted?
Signs of corruption include frequent disconnections, inability to connect to any network, or error messages in Device Manager stating that the device cannot start. Checking the Event Viewer for network-related errors can also confirm driver failures. Reinstalling the driver resolves most corruption issues.