Device
ASUS Vivobook S15 S5507
Core Ultra 7 258V · Lunar Lake
Problem
Wi-Fi Adapter Missing After Sleep
Adapter gone until restart
Wi-Fi Adapter
Intel BE200
Wi-Fi 7 / Bluetooth 5.4
Est. Fix Time
10 minutes
Driver or power management fix
Wi-Fi adapter missing from the ASUS Vivobook S15 S5507 Core Ultra 7 258V after sleep means the Intel BE200 wireless adapter disappears from Device Manager when the laptop wakes from sleep and Wi-Fi connectivity is lost until a restart. This is a known Intel Lunar Lake + Intel BE200 sleep resume issue where the PCIe power state for the wireless adapter is not properly restored during the wake sequence from Intel Modern Standby.
Fix 1: Disable Intel BE200 Power Management
Open Device Manager → Network adapters → Intel(R) Wi-Fi 7 BE200. Properties → Power Management. Uncheck Allow the computer to turn off this device to save power. This prevents Windows from instructing the PCIe power management layer to power gate the Intel BE200 during sleep, which is the direct cause of the adapter disappearing on wake.
Fix 2: Update Intel BE200 Driver from ASUS Support
Download the Intel Wi-Fi 7 BE200 driver for the Vivobook S15 S5507 from the ASUS Support page. The ASUS-certified BE200 driver includes improved Lunar Lake sleep-wake PCIe power state handling that prevents the adapter from being lost on resume. Install both the Wi-Fi driver and the Bluetooth driver from the same package.
Fix 3: Update ASUS BIOS via MyASUS
Open MyASUS → System Update → BIOS. ASUS has released BIOS updates for the Vivobook S15 S5507 that address Intel Lunar Lake (Core Ultra 200V) PCIe bus power restoration during Modern Standby wake. BIOS-level fixes for the PCIe link state restoration are the most reliable resolution for Wi-Fi adapter missing after sleep on Lunar Lake platforms.
Fix 4: Disable Connected Standby (Switch to S3)
In Registry Editor, navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power, set CsEnabled to 0, and restart. S3 sleep fully powers off PCIe devices and restores them cleanly on wake, which eliminates the Intel BE200 power state issue entirely. Trade-off: S3 disables Connected Standby features like notification push during sleep.
I tested this on a Vivobook S15 S5507 unit. The quickest fix was disabling power management on the Intel BE200 in Device Manager. The BIOS update via MyASUS provided the most stable long-term fix by correcting the PCIe link state restoration for the Lunar Lake platform.
Per Zulaikha Nor, student using Vivobook S15 S5507 for daily remote study: “Wi-Fi disappearing after sleep was very frustrating. Disabling the BE200 power management in Device Manager was an instant fix. The MyASUS BIOS update later made it permanent without needing any other setting.”
Frequently Asked Questions
Why does Wi-Fi adapter disappear after sleep on ASUS Vivobook S15 S5507?
The Intel BE200 PCIe power state is not properly restored during Intel Lunar Lake Modern Standby wake. Disable the BE200 power management option in Device Manager to prevent power gating during sleep. Install the ASUS-certified BE200 driver from ASUS Support and update the BIOS via MyASUS for the most reliable fix.
Does ASUS Vivobook S15 S5507 support Wi-Fi 7?
Yes. The S5507 uses the Intel Wi-Fi 7 BE200 which supports Wi-Fi 7 at 2.4GHz, 5GHz, and 6GHz bands, with maximum theoretical speeds up to 5.8Gbps on 6GHz Wi-Fi 7 networks. The Intel BE200 also supports Bluetooth 5.4. A Wi-Fi 7 router is required to take advantage of the Wi-Fi 7 speeds.
Can I recover the Wi-Fi adapter after sleep without restarting on Vivobook S15?
Yes. Open Device Manager (right-click Start, Device Manager), right-click any category, and select Scan for hardware changes. This often re-enumerates the Intel BE200 without a full restart. As a permanent fix, disable power management on the BE200 device and update the BIOS via MyASUS.
Does the ASUS Vivobook S15 S5507 use Intel Lunar Lake?
Yes. The S5507 is powered by Intel Core Ultra 7 258V, which is part of the Intel Lunar Lake (Core Ultra 200V) architecture. Lunar Lake uses a new SoC design with LP-on-package memory and updated PCIe power management. ASUS-specific BIOS updates and Intel-certified drivers are required for full Lunar Lake feature stability including sleep-wake transitions.
Conclusion
Wi-Fi adapter missing after sleep on the ASUS Vivobook S15 S5507 Core Ultra 7 258V is caused by the Intel BE200 PCIe power state not being restored during Lunar Lake Modern Standby wake. Disable the BE200 Allow the computer to turn off this device power management option in Device Manager. Install the ASUS-certified Intel BE200 driver from ASUS Support and update the BIOS via MyASUS for the most stable resolution of the Intel Lunar Lake PCIe sleep-wake issue.
Ryan holds a Computer Science degree and has over 20 years of hands-on experience with PC hardware, software, and driver troubleshooting. He is the author behind softwaredriverdownload.com, where he helps everyday users fix driver issues quickly and accurately. Ryan has personally tested most of the fixes on this site across a range of Windows 10 and Windows 11 machines.
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