linux-kernel - Re: [PATCH] drv/usb: Fix the issue with Realtek USB wireless adapter AC650

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Date: Tue, 25 Jun 2024 21:22:20 +0700
From: Lars Melin <larsm17@...il.com>
To: tuhaowen <tuhaowen@...ontech.com>, stern@...land.harvard.edu,
 gregkh@...uxfoundation.org
Cc: linux-usb@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
 linux-kernel@...r.kernel.org, wangyuli@...ontech.com
Subject: Re: [PATCH] drv/usb: Fix the issue with Realtek USB wireless adapter
 AC650

On 2024-06-25 14:07, tuhaowen wrote:
> Due to the dual-mode functionality of the Realtek USB wireless
> adapter AC650, it initially presents itself as a flash drive
> before the driver is installed.
> 
> In Linux, multi-state devices are recognized as storage devices
> on startup because the driver has not yet been loaded.
> 
> As a result, the AC650 is identified as a DISK device at boot,
> preventing the use of its WLAN mode. The issue can only be
> resolved by unplugging and replugging the adapter.
> 

It can be resolved by manually ejecting the created cdrom drive or by 
using usb_modeswitch which will eject the drive as soon as it is 
detected. No need for unplugging/replugging.

thanks
Lars