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Disconnecting a keyboard helped. It was not enough power to power all the devices connected to the USB hub.

Thank you for reply. It's definitely not fake as I use the same on Raspberry Pi and it works fine. Raspberry pi: sudo lsusb Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 005: ID 275d:0ba6 USB OPTICAL MOUSE Bus 001 Device 004: ID 27c0:0818 Cadwell Laboratories, Inc. Paperlike HD-FT Bus 001 Device 003: ID 1a86:7523 QinHeng Electronics CH340 serial converter Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub sudo lsusb -t -v /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M ID 1d6b:0003 Linux Foundation 3.0 root hub /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M ID 1d6b:0002 Linux Foundation 2.0 root hub |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M ID 2109:3431 VIA Labs, Inc. Hub |__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=ch341, 12M ID 1a86:7523 QinHeng Electronics CH340 serial converter |__ Port 2: Dev 4, If 1, Class=Human Interface Device, Driver=usbhid, 12M ID 27c0:0818 Cadwell Laboratories, Inc. Paperlike HD-FT |__ Port 2: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 12M ID 27c0:0818 Cadwell Laboratories, Inc. Paperlike HD-FT |__ Port 3: Dev 5, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M ID 275d:0ba6 ls /dev/ | grep -i usb ttyUSB0 usb Banana Pie sudo lsusb Bus 002 Device 006: ID 413c:2110 Dell Computer Corp. Dell Wired Multimedia Keyboard Bus 002 Device 005: ID 1a86:7523 QinHeng Electronics CH340 serial converter Bus 002 Device 004: ID 413c:1010 Dell Computer Corp. USB 2.0 Hub [MTT] Bus 002 Device 003: ID 05c6:f00e Qualcomm, Inc. Android Bus 002 Device 002: ID 0a05:7211 Unknown Manufacturer hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub sudo lsusb -t -v /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ohci-platform/1p, 12M ID 1d6b:0001 Linux Foundation 1.1 root hub |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 12M ID 0a05:7211 Unknown Manufacturer hub |__ Port 2: Dev 3, If 0, Class=Wireless, Driver=rndis_host, 12M ID 05c6:f00e Qualcomm, Inc. |__ Port 2: Dev 3, If 1, Class=CDC Data, Driver=rndis_host, 12M ID 05c6:f00e Qualcomm, Inc. |__ Port 4: Dev 4, If 0, Class=Hub, Driver=hub/4p, 12M ID 413c:1010 Dell Computer Corp. |__ Port 4: Dev 6, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M ID 413c:2110 Dell Computer Corp. |__ Port 4: Dev 6, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M ID 413c:2110 Dell Computer Corp. /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-platform/1p, 480M ID 1d6b:0002 Linux Foundation 2.0 root hub ls /dev/ | grep -i usb usb Looks like low power: armbian-hardware-monitor.log [ 4.212594] hub 2-1.4:1.0: USB hub found [ 4.214421] hub 2-1.4:1.0: 4 ports detected [ 4.524151] usb 2-1.4.1: new full-speed USB device number 5 using ohci-platform [ 4.640474] usb 2-1.4.1: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice=81.33 [ 4.640518] usb 2-1.4.1: New USB device strings: Mfr=0, Product=2, SerialNumber=0 [ 4.640533] usb 2-1.4.1: Product: USB Serial [ 4.641133] usb 2-1.4.1: rejected 1 configuration due to insufficient available bus power

Hi All, I have a BPI-M2 ZERO, BANANA-PI-ZERO with SERIAL to USB plugged in. It's being detected by lsusb Bus 002 Device 005: ID 1a86:7523 QinHeng Electronics CH340 serial converter but it doesn't appear under /dev/ttyUSB0 The problem is that I can't see it under /dev/ as /dev/ttyUSB0. I haven't tried installing CH340 drivers yet. Should I use the ones for Ubuntu? Here is the tutorial I found but I'm not sure if those are the correct drivers: https://learn.sparkfun.com/tutorials/how-to-install-ch340-drivers/all uname -a Linux bananapim2zero 6.2.13-sunxi #1 SMP Wed Apr 26 12:30:09 UTC 2023 armv7l GNU/Linux sudo lsusb Bus 002 Device 006: ID 413c:2110 Dell Computer Corp. Dell Wired Multimedia Keyboard Bus 002 Device 005: ID 1a86:7523 QinHeng Electronics CH340 serial converter Bus 002 Device 004: ID 413c:1010 Dell Computer Corp. USB 2.0 Hub [MTT] Bus 002 Device 003: ID 05c6:f00e Qualcomm, Inc. Android Bus 002 Device 002: ID 0a05:7211 Unknown Manufacturer hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub sudo lsusb -t -v /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ohci-platform/1p, 12M ID 1d6b:0001 Linux Foundation 1.1 root hub |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 12M ID 0a05:7211 Unknown Manufacturer hub |__ Port 2: Dev 3, If 0, Class=Wireless, Driver=rndis_host, 12M ID 05c6:f00e Qualcomm, Inc. |__ Port 2: Dev 3, If 1, Class=CDC Data, Driver=rndis_host, 12M ID 05c6:f00e Qualcomm, Inc. |__ Port 4: Dev 4, If 0, Class=Hub, Driver=hub/4p, 12M ID 413c:1010 Dell Computer Corp. |__ Port 4: Dev 6, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M ID 413c:2110 Dell Computer Corp. |__ Port 4: Dev 6, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M ID 413c:2110 Dell Computer Corp. /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-platform/1p, 480M ID 1d6b:0002 Linux Foundation 2.0 root hub grep CH34 /boot/config-6.2.13-sunxi CONFIG_USB_SERIAL_CH341=m ls /dev/ | grep -i usb usb ls /dev/ | grep -i tty tty tty0 tty1 tty10 tty11 tty12 tty13 tty14 tty15 tty16 tty17 tty18 tty19 tty2 tty20 tty21 tty22 tty23 tty24 tty25 tty26 tty27 tty28 tty29 tty3 tty30 tty31 tty32 tty33 tty34 tty35 tty36 tty37 tty38 tty39 tty4 tty40 tty41 tty42 tty43 tty44 tty45 tty46 tty47 tty48 tty49 ttty5 tty50 tty51 tty52 tty53 tty54 tty55 tty56 tty57 tty58 tty59 tty6 tty60 tty61 tty62 tty63 tty7 tty8 tty9 ttyS0 ttyS2 ttyS3 ttyS4 ttyS5 ttyS6 ttyS7