linux-kernel - Re: [PATCH] USB: storage: Ignore driver CD mode for Realtek multi-mode Wi-Fi dongles

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Message-ID: <20250814145926.3067-1-zenmchen@gmail.com>
Date: Thu, 14 Aug 2025 22:59:26 +0800
From: Zenm Chen <zenmchen@...il.com>
To: larsm17@...il.com
Cc: gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	pkshih@...ltek.com,
	rtl8821cerfe2@...il.com,
	stable@...r.kernel.org,
	stern@...land.harvard.edu,
	usb-storage@...ts.one-eyed-alien.net,
	usbwifi2024@...il.com,
	zenmchen@...il.com
Subject: Re: [PATCH] USB: storage: Ignore driver CD mode for Realtek multi-mode Wi-Fi dongles

> Hi Lars,
> 
> If I apply this patch to my kernel, usb_modeswitch can switch both to
> Wi-Fi mode smoothly and fastly, but I don't know why. @@

I forgot to say that I've added one more entry into /lib/udev/rules.d/40-usb_modeswitch.rules
to let usb_modeswitch support the ID 0bda:a192.

$ grep -E "1a2b|a192" -i /lib/udev/rules.d/40-usb_modeswitch.rules 
ATTR{idVendor}=="0bda", ATTR{idProduct}=="1a2b", RUN+="usb_modeswitch '/%k'"
ATTR{idVendor}=="0bda", ATTR{idProduct}=="a192", RUN+="usb_modeswitch '/%k'"

A config file in /usr/share/usb_modeswitch for the ID 0bda:a192 was also created.

$ cat /usr/share/usb_modeswitch/0bda\:a192
# RTL8192FU
TargetVendor=0x0bda
TargetProduct=0xf192
StandardEject=1