Question 802.11AC adapter "resets" when connecting to 5GHz network, works fine on 2.4GHz

OnE61811301

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Nov 4, 2013
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Hello,

I bought a TP-link T9UH 802.11AC USB dongle and encountered a problem when trying to use it on my (old) Asus N56VZ laptop, Win10 OS.

It behaves perfect when I connect it on the 2.4GHz band - it's as fast as possible, the connection is strong and stable, etc. No issues here.

As soon as I try to connect to the 5GHz band, it "resets"(the adapter lights off, you hear the "unplugged usb device" sound, then the "plugged-in" sound), then it connects successfully, and shows that conn speed is 866/866Mbps, again stable and strong signal. But on speedtest the network speed barely reaches 10-20Mbps and it jumps up and down. Local network transfers(samba) are even worse at ~200-500KB/s.

The following errors appear in the event viewer around the time of the "reset":
WLAN Extensibility Module has successfully started.
Module Path: C:\WINDOWS\system32\Rtlihvs.dll

WLAN Extensibility Module has stopped.
Module Path: C:\WINDOWS\system32\Rtlihvs.dll

WLAN Extensibility Module has successfully started.
Module Path: C:\WINDOWS\system32\Rtlihvs.dll

WLAN Extensibility Module has stopped unexpectedly.
Module Path: C:\WINDOWS\system32\Rtlihvs.dll

The driver detected an internal driver error on \Device\VBoxNetLwf.
Faulting application name: WLANExt.exe, version: 10.0.19041.1, time stamp: 0x45c477dd
Faulting module name: ntdll.dll, version: 10.0.19041.1202, time stamp: 0x4f115fac
Exception code: 0xc0000374
Fault offset: 0x00000000000ff199
Faulting process id: 0x8ec
Faulting application path: C:\WINDOWS\system32\WLANExt.exe
Faulting module path: C:\WINDOWS\SYSTEM32\ntdll.dll

The RunSwUSB service is marked as an interactive service. However, the system is configured to not allow interactive services. This service may not function properly.

Tried the adapter on another laptop and on the desktop PC and it works fine there. Any help would be welcome.
 

Ralston18

Titan
Moderator
On the Asus N56VZ laptop are all other network adapters (wired or wireless) disabled?

Only one network adapter (in your case the TP-link T9UH 802.11AC adapter) should be enabled at any given time.

And try using a USB extension cable to move the USB adapter up and away from the laptop. Or at least change the physical connectivity between USB wireless adapter and laptop.

Next try manually downloading the USB wireless adapter drivers via TP-Link's website. Reinstall and reconfigure.

If necessary, try the built-in Windows troubleshooters - the troubleshooters may find and fix something.

Lastly try "sfc /scannow" and "dism".

References:

https://www.lifewire.com/how-to-use-sfc-scannow-to-repair-windows-system-files-2626161

Fix Windows Update errors via DISM or System Update Readiness tool - Windows Server | Microsoft Docs
 

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