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[118.232.8.190]) by smtp.googlemail.com with ESMTPSA id d2e1a72fcca58-76bccfd1d8csm32813848b3a.101.2025.08.13.15.54.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Aug 2025 15:54:21 -0700 (PDT) From: Zenm Chen To: stern@rowland.harvard.edu Cc: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, pkshih@realtek.com, rtl8821cerfe2@gmail.com, stable@vger.kernel.org, usb-storage@lists.one-eyed-alien.net, usbwifi2024@gmail.com, zenmchen@gmail.com Subject: Re: [PATCH] USB: storage: Ignore driver CD mode for Realtek multi-mode Wi-Fi dongles Date: Thu, 14 Aug 2025 06:54:15 +0800 Message-ID: <20250813225417.4792-1-zenmchen@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <03d4c721-f96d-4ace-b01e-c7adef150209@rowland.harvard.edu> References: <03d4c721-f96d-4ace-b01e-c7adef150209@rowland.harvard.edu> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Alan Stern 於 2025年8月14日 週四 上午2:19寫道： > > On Thu, Aug 14, 2025 at 01:53:12AM +0800, Zenm Chen wrote: > > Alan Stern 於 2025年8月14日 週四 上午12:58寫道： > > > > > > On Thu, Aug 14, 2025 at 12:24:15AM +0800, Zenm Chen wrote: > > > > Many Realtek USB Wi-Fi dongles released in recent years have two modes: > > > > one is driver CD mode which has Windows driver onboard, another one is > > > > Wi-Fi mode. Add the US_FL_IGNORE_DEVICE quirk for these multi-mode devices. > > > > Otherwise, usb_modeswitch may fail to switch them to Wi-Fi mode. > > > > > > There are several other entries like this already in the unusual_devs.h > > > file. But I wonder if we really still need them. Shouldn't the > > > usb_modeswitch program be smart enough by now to know how to handle > > > these things? > > > > Hi Alan, > > > > Thanks for your review and reply. > > > > Without this patch applied, usb_modeswitch cannot switch my Mercury MW310UH > > into Wi-Fi mode [1]. > > Don't post a link to a video; it's not very helpful. Instead, copy the > output from the usb_modeswitch program and include it in an email > message. Sorry about that. > > > I also ran into a similar problem like [2] with D-Link > > AX9U, so I believe this patch is needed. > > Maybe it is and maybe not. It depends on where the underlying problem > is. If the problem is in the device then yes, the patch probably is > needed. But if the problem is in usb_modeswitch then the patch probably > is not needed. > > > > In theory, someone might want to access the Windows driver on the > > > emulated CD. With this quirk, they wouldn't be able to. > > > > > > > Actually an emulated CD doesn't appear when I insert these 2 Wi-Fi dongles into > > my Linux PC, so users cannot access that Windows driver even if this patch is not > > applied. > > What does happen when you insert the WiFi dongle? That is, what > messages appear in the dmesg log? OS: Arch Linux Kernel version: 6.15.9-arch1-1 These are the messages shown in the kernel log when the dongles were inserted. Mercury MW310UH: [ 4405.000985] usb 3-2: new high-speed USB device number 31 using ehci-pci [ 4405.126736] usb 3-2: New USB device found, idVendor=0bda, idProduct=a192, bcdDevice= 2.00 [ 4405.126750] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 4405.126756] usb 3-2: Product: DISK [ 4405.126760] usb 3-2: Manufacturer: Realtek [ 4405.127200] usb-storage 3-2:1.0: USB Mass Storage device detected [ 4405.127632] scsi host8: usb-storage 3-2:1.0 [ 4406.155867] scsi 8:0:0:0: CD-ROM Realtek USB Disk autorun 1.00 PQ: 0 ANSI: 0 CCS [ 4406.164982] sr 8:0:0:0: [sr0] scsi-1 drive [ 4406.169602] sr 8:0:0:0: [sr0] Hmm, seems the drive doesn't support multisession CD's [ 4406.282981] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4406.530027] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4406.776991] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4407.023992] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4407.263927] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4407.510987] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4407.757988] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4408.004967] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4408.244989] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4408.491971] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4408.738973] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4408.985967] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4409.225847] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4409.473012] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4409.719978] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4409.966958] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4410.206962] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4410.453952] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4410.700965] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4410.947959] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4411.187950] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4411.434956] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4411.681959] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4411.928970] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4412.054904] sr 8:0:0:0: Attached scsi CD-ROM sr0 [ 4412.055122] sr 8:0:0:0: Attached scsi generic sg3 type 5 [ 4412.168955] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4412.416956] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4412.663960] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4412.910947] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4413.150951] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4413.397994] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4413.645959] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4413.892990] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4414.133942] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4414.380798] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4414.621191] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4414.867934] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4415.117949] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4415.364797] usb 3-2: reset high-speed USB device number 31 using ehci-pci ... Countless "usb 3-2: reset high-speed USB device number 31 using ehci-pci" appearred here. [ 4854.437661] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4854.684646] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4856.951643] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4857.198641] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4857.445642] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4857.692644] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4859.959629] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4860.207512] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4860.454675] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4860.701628] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4862.968616] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4863.215613] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4863.462670] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4863.709608] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4865.975479] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4866.224610] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4866.471590] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4866.718605] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4868.983453] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4869.230624] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4869.477582] usb 3-2: reset high-speed USB device number 31 using ehci-pci [ 4869.724579] usb 3-2: reset high-speed USB device number 31 using ehci-pci D-Link AX9U: [ 6400.069566] usb 3-2: new high-speed USB device number 38 using ehci-pci [ 6400.195236] usb 3-2: New USB device found, idVendor=0bda, idProduct=1a2b, bcdDevice= 0.00 [ 6400.195250] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 6400.195256] usb 3-2: Product: DISK [ 6400.195261] usb 3-2: Manufacturer: Realtek [ 6400.197475] usb-storage 3-2:1.0: USB Mass Storage device detected [ 6400.197768] scsi host8: usb-storage 3-2:1.0 [ 6401.481648] scsi 8:0:0:0: CD-ROM RTK Driver Storage 2.04 PQ: 0 ANSI: 0 CCS [ 6401.483955] sr 8:0:0:0: [sr0] scsi3-mmc drive: 0x/0x caddy [ 6401.487626] sr 8:0:0:0: Attached scsi CD-ROM sr0 [ 6401.487828] sr 8:0:0:0: Attached scsi generic sg3 type 5 [ 6432.007456] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6462.723317] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6493.447105] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6524.163962] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6554.882745] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6565.190684] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6595.846508] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6626.562333] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6657.283170] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6688.002984] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6718.721814] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6749.445506] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6759.549662] INFO: task (udev-worker):2838 blocked for more than 122 seconds. [ 6759.549677] Not tainted 6.15.9-arch1-1 #1 [ 6759.549682] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 6759.549685] task:(udev-worker) state:D stack:0 pid:2838 tgid:2838 ppid:329 task_flags:0x400140 flags:0x00004002 [ 6759.549697] Call Trace: [ 6759.549701] [ 6759.549709] __schedule+0x409/0x1330 [ 6759.549727] schedule+0x27/0xd0 [ 6759.549735] schedule_preempt_disabled+0x15/0x30 [ 6759.549743] __mutex_lock.constprop.0+0x481/0x880 [ 6759.549754] ? __pfx_blkdev_open+0x10/0x10 [ 6759.549763] bdev_open+0x2a0/0x3d0 [ 6759.549771] ? __pfx_blkdev_open+0x10/0x10 [ 6759.549777] blkdev_open+0xa5/0x100 [ 6759.549785] do_dentry_open+0x170/0x5d0 [ 6759.549794] vfs_open+0x30/0x100 [ 6759.549804] path_openat+0x717/0x1300 [ 6759.549813] ? path_openat+0x98c/0x1300 [ 6759.549821] do_filp_open+0xd8/0x180 [ 6759.549834] do_sys_openat2+0x88/0xe0 [ 6759.549841] __x64_sys_openat+0x61/0xa0 [ 6759.549847] do_syscall_64+0x7b/0x810 [ 6759.549856] ? do_syscall_64+0x87/0x810 [ 6759.549863] ? do_syscall_64+0x87/0x810 [ 6759.549869] ? set_pte_range+0xe2/0x200 [ 6759.549879] ? set_ptes.isra.0+0x36/0x80 [ 6759.549886] ? finish_fault+0x22f/0x460 [ 6759.549895] ? do_fault+0x3a7/0x5b0 [ 6759.549903] ? ___pte_offset_map+0x1b/0x180 [ 6759.549912] ? __handle_mm_fault+0x7de/0xfd0 [ 6759.549918] ? do_epoll_ctl+0xa80/0xdd0 [ 6759.549926] ? __count_memcg_events+0xb0/0x150 [ 6759.549934] ? count_memcg_events.constprop.0+0x1a/0x30 [ 6759.549941] ? handle_mm_fault+0x1d2/0x2d0 [ 6759.549948] ? do_user_addr_fault+0x181/0x690 [ 6759.549957] ? irqentry_exit_to_user_mode+0x2c/0x1b0 [ 6759.549966] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 6759.549974] RIP: 0033:0x7fc19fe931ce [ 6759.549995] RSP: 002b:00007ffe87a741b0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 [ 6759.550003] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc19fe931ce [ 6759.550008] RDX: 0000000000080900 RSI: 00007ffe87a74270 RDI: ffffffffffffff9c [ 6759.550012] RBP: 00007ffe87a741c0 R08: 0000000000000000 R09: 0000000000000000 [ 6759.550017] R10: 0000000000000000 R11: 0000000000000202 R12: 000055eaf18c4470 [ 6759.550021] R13: 00007ffe87a74500 R14: 0000000000080900 R15: 0000000000000015 [ 6759.550030] [ 6759.550054] INFO: task (udev-worker):2838 is blocked on a mutex likely owned by task udisksd:706. [ 6759.550059] task:udisksd state:D stack:0 pid:706 tgid:706 ppid:1 task_flags:0x400100 flags:0x00004002 [ 6759.550068] Call Trace: [ 6759.550071] [ 6759.550075] __schedule+0x409/0x1330 [ 6759.550084] ? lock_timer_base+0x70/0x90 [ 6759.550094] schedule+0x27/0xd0 [ 6759.550101] schedule_timeout+0x83/0x100 [ 6759.550109] ? __pfx_process_timeout+0x10/0x10 [ 6759.550117] io_schedule_timeout+0x5b/0x90 [ 6759.550124] wait_for_completion_io_timeout+0x7f/0x1a0 [ 6759.550134] blk_execute_rq+0xee/0x170 [ 6759.550145] scsi_execute_cmd+0x100/0x420 [ 6759.550157] scsi_test_unit_ready+0x6f/0xf0 [ 6759.550172] sr_drive_status+0x57/0x120 [sr_mod de25504f195c3fb7b76d163270dae636af6d4152] [ 6759.550187] cdrom_open+0xd4/0xab0 [cdrom ff26b01442b014534657abb98fa7fb688822fb56] [ 6759.550208] ? __disk_unblock_events+0x26/0xc0 [ 6759.550219] ? disk_check_media_change+0x96/0xe0 [ 6759.550229] sr_block_open+0x71/0x110 [sr_mod de25504f195c3fb7b76d163270dae636af6d4152] [ 6759.550239] ? __pfx_blkdev_open+0x10/0x10 [ 6759.550246] blkdev_get_whole+0x2c/0xe0 [ 6759.550253] ? __pfx_blkdev_open+0x10/0x10 [ 6759.550259] bdev_open+0x201/0x3d0 [ 6759.550266] ? __pfx_blkdev_open+0x10/0x10 [ 6759.550272] blkdev_open+0xa5/0x100 [ 6759.550279] do_dentry_open+0x170/0x5d0 [ 6759.550287] vfs_open+0x30/0x100 [ 6759.550296] path_openat+0x717/0x1300 [ 6759.550304] ? __memcg_slab_free_hook+0xf7/0x140 [ 6759.550312] do_filp_open+0xd8/0x180 [ 6759.550325] do_sys_openat2+0x88/0xe0 [ 6759.550386] __x64_sys_openat+0x61/0xa0 [ 6759.550397] do_syscall_64+0x7b/0x810 [ 6759.550406] ? vfs_read+0x2af/0x390 [ 6759.550419] ? ksys_read+0xa8/0xe0 [ 6759.550429] ? syscall_exit_to_user_mode+0x37/0x1c0 [ 6759.550439] ? do_syscall_64+0x87/0x810 [ 6759.550448] ? irqentry_exit_to_user_mode+0x2c/0x1b0 [ 6759.550458] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 6759.550466] RIP: 0033:0x7f3ced89f042 [ 6759.550479] RSP: 002b:00007fff0e8d04f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 6759.550488] RAX: ffffffffffffffda RBX: 0000562237bedca0 RCX: 00007f3ced89f042 [ 6759.550494] RDX: 0000000000000000 RSI: 0000562237bbc6e0 RDI: ffffffffffffff9c [ 6759.550499] RBP: 00007fff0e8d0520 R08: 0000000000000000 R09: 0000000000000000 [ 6759.550504] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff0e8d0650 [ 6759.550509] R13: 00007fff0e8d0654 R14: 0000562237bf1b80 R15: 0000562237bb0fe0 [ 6759.550520] [ 6780.163423] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6787.459425] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6797.765312] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6828.289146] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6859.013081] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6889.732859] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6900.036820] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6930.692665] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6961.412477] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 6992.132215] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 7022.852189] usb 3-2: reset high-speed USB device number 38 using ehci-pci [ 7030.145050] usb 3-2: reset high-speed USB device number 38 using ehci-pci When trying to mount these two Wi-Fi dongles' driver CD, I got this error. $ sudo mount /dev/sr0 /mnt/tmp mount: /mnt/tmp: fsconfig() failed: /dev/sr0: Can't open blockdev. dmesg(1) may have more information after failed mount system call. usb_modeswitch can switch D-Link AX9U into Wi-Fi mode successfully, but it took a very long time (about 40 seconds). $ lsusb Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 002: ID 0bda:5852 Realtek Semiconductor Corp. Bluetooth Radio Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 002: ID 2717:4106 Xiaomi Inc. MediaTek MT7601U [MI WiFi] Bus 003 Device 035: ID 0bda:1a2b Realtek Semiconductor Corp. RTL8188GU 802.11n WLAN Adapter (Driver CDROM Mode) Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 002: ID 046d:c077 Logitech, Inc. Mouse Bus 004 Device 003: ID 05af:1023 Jing-Mold Enterprise Co., Ltd Ghost Key Elimiantion Keyboard Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 008 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub $ sudo usb_modeswitch -v 0bda -p 1a2b -KW Take all parameters from the command line * usb_modeswitch: handle USB devices with multiple modes * Version 2.6.2 (C) Josua Dietze 2017 * Based on libusb1/libusbx ! PLEASE REPORT NEW CONFIGURATIONS ! DefaultVendor= 0x0bda DefaultProduct= 0x1a2b StandardEject=1 Look for default devices ... found USB ID 2717:4106 found USB ID 0bda:1a2b vendor ID matched product ID matched found USB ID 1d6b:0002 found USB ID 05af:1023 found USB ID 046d:c077 found USB ID 1d6b:0001 found USB ID 1d6b:0002 found USB ID 0bda:5852 vendor ID matched found USB ID 1d6b:0001 found USB ID 1d6b:0003 found USB ID 1d6b:0002 found USB ID 1d6b:0003 found USB ID 1d6b:0002 Found devices in default mode (1) Access device 035 on bus 003 Get the current device configuration ... Current configuration number is 1 Use interface number 0 with class 8 Use endpoints 0x05 (out) and 0x84 (in) USB description data (for identification) ------------------------- Manufacturer: Realtek Product: DISK Serial No.: not provided ------------------------- Sending standard EJECT sequence Looking for active drivers ... OK, driver detached Set up interface 0 Use endpoint 0x05 for message sending ... Trying to send message 1 to endpoint 0x05 ... Sending the message returned error -7. Try to continue Read the response to message 1 (CSW) ... Response successfully read (13 bytes), status 1 Trying to send message 2 to endpoint 0x05 ... OK, message successfully sent Read the response to message 2 (CSW) ... Response successfully read (13 bytes), status 0 Trying to send message 3 to endpoint 0x05 ... libusb: error [submit_bulk_transfer] submiturb failed, errno=113 Sending the message returned error -1. Try to continue Read the response to message 3 (CSW) ... Device seems to have vanished after reading. Good. Device is gone, skip any further commands -> Run lsusb to note any changes. Bye! $ lsusb Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 002: ID 0bda:5852 Realtek Semiconductor Corp. Bluetooth Radio Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 002: ID 2717:4106 Xiaomi Inc. MediaTek MT7601U [MI WiFi] Bus 003 Device 036: ID 2001:332a D-Link Corp. 802.11ax WLAN Adapter Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 002: ID 046d:c077 Logitech, Inc. Mouse Bus 004 Device 003: ID 05af:1023 Jing-Mold Enterprise Co., Ltd Ghost Key Elimiantion Keyboard Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 008 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub On the other side, Mercury MW310UH cannot be switched successfully. $ sudo usb_modeswitch -v 0bda -p a192 -KW Take all parameters from the command line * usb_modeswitch: handle USB devices with multiple modes * Version 2.6.2 (C) Josua Dietze 2017 * Based on libusb1/libusbx ! PLEASE REPORT NEW CONFIGURATIONS ! DefaultVendor= 0x0bda DefaultProduct= 0xa192 StandardEject=1 Look for default devices ... found USB ID 2717:4106 found USB ID 0bda:a192 vendor ID matched product ID matched found USB ID 1d6b:0002 found USB ID 05af:1023 found USB ID 046d:c077 found USB ID 1d6b:0001 found USB ID 1d6b:0002 found USB ID 0bda:5852 vendor ID matched found USB ID 1d6b:0001 found USB ID 1d6b:0003 found USB ID 1d6b:0002 found USB ID 1d6b:0003 found USB ID 1d6b:0002 Found devices in default mode (1) Access device 033 on bus 003 Get the current device configuration ... Current configuration number is 1 Use interface number 0 with class 8 Use endpoints 0x0b (out) and 0x8a (in) USB description data (for identification) ------------------------- Manufacturer: Realtek Product: DISK Serial No.: not provided ------------------------- Sending standard EJECT sequence Looking for active drivers ... OK, driver detached Set up interface 0 Use endpoint 0x0b for message sending ... Trying to send message 1 to endpoint 0x0b ... OK, message successfully sent Read the response to message 1 (CSW) ... Response reading failed (error -8) Device is gone, skip any further commands -> Run lsusb to note any changes. Bye! $ lsusb Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 002: ID 0bda:5852 Realtek Semiconductor Corp. Bluetooth Radio Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 002: ID 2717:4106 Xiaomi Inc. MediaTek MT7601U [MI WiFi] Bus 003 Device 033: ID 0bda:a192 Realtek Semiconductor Corp. DISK Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 002: ID 046d:c077 Logitech, Inc. Mouse Bus 004 Device 003: ID 05af:1023 Jing-Mold Enterprise Co., Ltd Ghost Key Elimiantion Keyboard Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 008 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub > > Also, can you collect a usbmon trace showing what happens when the > dongle is plugged in? I am not familiar with this, but I will try these days, thank you! > > Alan Stern