USB Crashes when more than 17 dongles connect

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vijay ramnarine

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Apr 2, 2020, 1:27:11 PM4/2/20
to dongle
Linux raspberrypi 4.19.97-v7l+ #1294 SMP Thu Jan 30 13:21:14 GMT 2020 armv7l GNU/Linux
Using a sipolar 20 port powered hub

when 17 devices connected
root@raspberrypi:~# lsusb
Bus 002 Device 007: ID 0bda:0411 Realtek Semiconductor Corp. 
Bus 002 Device 006: ID 0bda:0411 Realtek Semiconductor Corp. 
Bus 002 Device 005: ID 0bda:0411 Realtek Semiconductor Corp. 
Bus 002 Device 004: ID 0bda:0411 Realtek Semiconductor Corp. 
Bus 002 Device 003: ID 0bda:0411 Realtek Semiconductor Corp. 
Bus 002 Device 002: ID 0bda:0411 Realtek Semiconductor Corp. 
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 018: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 025: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 023: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 021: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 019: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 016: ID 0bda:5411 Realtek Semiconductor Corp. 
Bus 001 Device 024: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 022: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 020: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 026: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 013: ID 0bda:5411 Realtek Semiconductor Corp. 
Bus 001 Device 009: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 006: ID 0bda:5411 Realtek Semiconductor Corp. 
Bus 001 Device 010: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 014: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 011: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 007: ID 0bda:5411 Realtek Semiconductor Corp. 
Bus 001 Device 015: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 012: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 008: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 005: ID 0bda:5411 Realtek Semiconductor Corp. 
Bus 001 Device 004: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem
Bus 001 Device 003: ID 0bda:5411 Realtek Semiconductor Corp. 
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

root@raspberrypi:~# lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

vijay ramnarine

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Apr 2, 2020, 1:29:00 PM4/2/20
to dongle
If I connect 18th device 

Adrian Sandu

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Apr 2, 2020, 1:33:22 PM4/2/20
to chan_...@googlegroups.com
Years ago I had a similar problem with some disk drives...turns out there's a limit in the USB hub memory or something like that regarding the number of device descriptors ...but maybe this is different. Kernel logs would help...

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