For some reason usb-devel is bouncing these messages saying: Message rejected by filter rule match
Anyway, kernel 2.6.18 compiled with CONFIG_USB_DEBUG=y dmesg seems more detailed but /var/log/messages is not, so I have both: Anyway, here goes: Here we have /var/log/messages of the modprobe May 24 10:16:38 shep kernel: USB Universal Host Controller Interface driver v3.0 May 24 10:16:38 shep kernel: PCI: Enabling device 0000:00:07.2 (0000 -> 0001) May 24 10:16:38 shep kernel: PCI: Found IRQ 7 for device 0000:00:07.2 May 24 10:16:38 shep kernel: PCI: Sharing IRQ 7 with 0000:00:07.3 May 24 10:16:38 shep kernel: PCI: Sharing IRQ 7 with 0000:00:0a.0 May 24 10:16:38 shep kernel: uhci_hcd 0000:00:07.2: UHCI Host Controller May 24 10:16:38 shep kernel: uhci_hcd 0000:00:07.2: new USB bus registered, assigned bus number 1 May 24 10:16:38 shep kernel: uhci_hcd 0000:00:07.2: detected 2 ports May 24 10:16:38 shep kernel: uhci_hcd 0000:00:07.2: irq 7, io base 0x0000d400 May 24 10:16:38 shep kernel: usb usb1: Product: UHCI Host Controller May 24 10:16:38 shep kernel: usb usb1: Manufacturer: Linux 2.6.18sam uhci_hcd May 24 10:16:38 shep kernel: usb usb1: SerialNumber: 0000:00:07.2 May 24 10:16:38 shep kernel: usb usb1: configuration #1 chosen from 1 choice May 24 10:16:38 shep kernel: hub 1-0:1.0: USB hub found May 24 10:16:38 shep kernel: hub 1-0:1.0: 2 ports detected May 24 10:16:38 shep kernel: PCI: Enabling device 0000:00:07.3 (0000 -> 0001) May 24 10:16:38 shep kernel: PCI: Found IRQ 7 for device 0000:00:07.3 May 24 10:16:38 shep kernel: PCI: Sharing IRQ 7 with 0000:00:07.2 May 24 10:16:38 shep kernel: PCI: Sharing IRQ 7 with 0000:00:0a.0 May 24 10:16:38 shep kernel: uhci_hcd 0000:00:07.3: UHCI Host Controller May 24 10:16:38 shep kernel: uhci_hcd 0000:00:07.3: new USB bus registered, assigned bus number 2 May 24 10:16:38 shep kernel: uhci_hcd 0000:00:07.3: detected 2 ports May 24 10:16:38 shep kernel: uhci_hcd 0000:00:07.3: irq 7, io base 0x0000d800 May 24 10:16:38 shep kernel: usb usb2: Product: UHCI Host Controller May 24 10:16:38 shep kernel: usb usb2: Manufacturer: Linux 2.6.18sam uhci_hcd May 24 10:16:38 shep kernel: usb usb2: SerialNumber: 0000:00:07.3 May 24 10:16:38 shep kernel: usb usb2: configuration #1 chosen from 1 choice May 24 10:16:38 shep kernel: hub 2-0:1.0: USB hub found May 24 10:16:38 shep kernel: hub 2-0:1.0: 2 ports detected May 24 10:16:39 shep kernel: usb 1-1: new low speed USB device using uhci_hcd and address 2 May 24 10:16:39 shep kernel: usb 1-1: Product: PS2 to USB Converter May 24 10:16:39 shep kernel: usb 1-1: Manufacturer: CHESEN May 24 10:16:39 shep kernel: usb 1-1: configuration #1 chosen from 1 choice May 24 10:16:39 shep kernel: input: CHESEN PS2 to USB Converter as /class/input/input15 May 24 10:16:39 shep kernel: input: USB HID v1.10 Keyboard [CHESEN PS2 to USB Converter] on usb-0000:00:07.2-1 May 24 10:16:39 shep kernel: input: CHESEN PS2 to USB Converter as /class/input/input16 May 24 10:16:39 shep kernel: input: USB HID v1.10 Mouse [CHESEN PS2 to USB Converter] on usb-0000:00:07.2-1 May 24 10:16:39 shep kernel: usb 1-2: new full speed USB device using uhci_hcd and address 3 May 24 10:16:39 shep kernel: usb 1-2: Product: Generic USB Hub May 24 10:16:39 shep kernel: usb 1-2: Manufacturer: ALCOR May 24 10:16:39 shep kernel: usb 1-2: configuration #1 chosen from 1 choice May 24 10:16:39 shep kernel: hub 1-2:1.0: USB hub found May 24 10:16:39 shep kernel: hub 1-2:1.0: 4 ports detected May 24 10:16:40 shep kernel: usb 1-2.1: new full speed USB device using uhci_hcd and address 4 May 24 10:16:40 shep kernel: usb 1-2.1: Product: USB HS SERIAL CONVERTER May 24 10:16:40 shep kernel: usb 1-2.1: Manufacturer: FTDI May 24 10:16:40 shep kernel: usb 1-2.1: SerialNumber: FTCEUPT7 May 24 10:16:40 shep kernel: usb 1-2.1: configuration #1 chosen from 1 choice May 24 10:16:40 shep kernel: ftdi_sio 1-2.1:1.0: FTDI USB Serial Device converter detected May 24 10:16:40 shep kernel: drivers/usb/serial/ftdi_sio.c: Detected FT232BM May 24 10:16:40 shep kernel: usb 1-2.1: FTDI USB Serial Device converter now attached to ttyUSB0 May 24 10:16:40 shep kernel: usb 1-2.2: new full speed USB device using uhci_hcd and address 5 May 24 10:16:40 shep kernel: usb 1-2.2: Product: USB HS SERIAL CONVERTER May 24 10:16:40 shep kernel: usb 1-2.2: Manufacturer: FTDI May 24 10:16:40 shep kernel: usb 1-2.2: SerialNumber: FTCEUPTD May 24 10:16:40 shep kernel: usb 1-2.2: configuration #1 chosen from 1 choice May 24 10:16:40 shep kernel: ftdi_sio 1-2.2:1.0: FTDI USB Serial Device converter detected May 24 10:16:40 shep kernel: drivers/usb/serial/ftdi_sio.c: Detected FT232BM May 24 10:16:40 shep kernel: usb 1-2.2: FTDI USB Serial Device converter now attached to ttyUSB1 Then I "logger MINICOM" and run minicom and power the remote end May 24 10:16:48 shep root: MINICOM May 24 10:16:52 shep kernel: usb 1-2: USB disconnect, address 3 May 24 10:16:52 shep kernel: usb 1-2.1: USB disconnect, address 4 May 24 10:16:52 shep kernel: ftdi_sio 1-2.1:1.0: device disconnected May 24 10:16:52 shep kernel: usb 1-2.2: USB disconnect, address 5 May 24 10:16:52 shep kernel: ftdi_sio ttyUSB1: FTDI USB Serial Device converter now disconnected from ttyUSB1 May 24 10:16:52 shep kernel: ftdi_sio 1-2.2:1.0: device disconnected May 24 10:16:53 shep kernel: usb 1-2: new full speed USB device using uhci_hcd and address 6 May 24 10:16:56 shep kernel: ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0 then I quit minicom and "logger done" May 24 10:16:59 shep root: done May 24 10:17:11 shep kernel: usb 1-2: new full speed USB device using uhci_hcd and address 7 Now the same; dmesg output for the modprobe: USB Universal Host Controller Interface driver v3.0 PCI: Enabling device 0000:00:07.2 (0000 -> 0001) PCI: Found IRQ 7 for device 0000:00:07.2 PCI: Sharing IRQ 7 with 0000:00:07.3 PCI: Sharing IRQ 7 with 0000:00:0a.0 uhci_hcd 0000:00:07.2: UHCI Host Controller drivers/usb/core/inode.c: creating file 'devices' drivers/usb/core/inode.c: creating file '001' uhci_hcd 0000:00:07.2: new USB bus registered, assigned bus number 1 uhci_hcd 0000:00:07.2: detected 2 ports uhci_hcd 0000:00:07.2: uhci_check_and_reset_hc: cmd = 0x0000 uhci_hcd 0000:00:07.2: Performing full reset uhci_hcd 0000:00:07.2: irq 7, io base 0x0000d400 usb usb1: default language 0x0409 usb usb1: new device strings: Mfr=3, Product=2, SerialNumber=1 usb usb1: Product: UHCI Host Controller usb usb1: Manufacturer: Linux 2.6.18sam uhci_hcd usb usb1: SerialNumber: 0000:00:07.2 usb usb1: uevent usb usb1: configuration #1 chosen from 1 choice usb usb1: adding 1-0:1.0 (config #1, interface 0) usb 1-0:1.0: uevent hub 1-0:1.0: usb_probe_interface hub 1-0:1.0: usb_probe_interface - got id hub 1-0:1.0: USB hub found hub 1-0:1.0: 2 ports detected hub 1-0:1.0: standalone hub hub 1-0:1.0: no power switching (usb 1.0) hub 1-0:1.0: individual port over-current protection hub 1-0:1.0: power on to power good time: 2ms hub 1-0:1.0: local power source is good hub 1-0:1.0: trying to enable port power on non-switchable hub drivers/usb/core/inode.c: creating file '001' PCI: Enabling device 0000:00:07.3 (0000 -> 0001) PCI: Found IRQ 7 for device 0000:00:07.3 PCI: Sharing IRQ 7 with 0000:00:07.2 PCI: Sharing IRQ 7 with 0000:00:0a.0 uhci_hcd 0000:00:07.3: UHCI Host Controller drivers/usb/core/inode.c: creating file '002' uhci_hcd 0000:00:07.3: new USB bus registered, assigned bus number 2 uhci_hcd 0000:00:07.3: detected 2 ports uhci_hcd 0000:00:07.3: uhci_check_and_reset_hc: cmd = 0x0000 uhci_hcd 0000:00:07.3: Performing full reset uhci_hcd 0000:00:07.3: irq 7, io base 0x0000d800 usb usb2: default language 0x0409 usb usb2: new device strings: Mfr=3, Product=2, SerialNumber=1 usb usb2: Product: UHCI Host Controller usb usb2: Manufacturer: Linux 2.6.18sam uhci_hcd usb usb2: SerialNumber: 0000:00:07.3 usb usb2: uevent usb usb2: configuration #1 chosen from 1 choice usb usb2: adding 2-0:1.0 (config #1, interface 0) usb 2-0:1.0: uevent hub 2-0:1.0: usb_probe_interface hub 2-0:1.0: usb_probe_interface - got id hub 2-0:1.0: USB hub found hub 2-0:1.0: 2 ports detected hub 2-0:1.0: standalone hub hub 2-0:1.0: no power switching (usb 1.0) hub 2-0:1.0: individual port over-current protection hub 2-0:1.0: power on to power good time: 2ms hub 2-0:1.0: local power source is good hub 2-0:1.0: trying to enable port power on non-switchable hub hub 1-0:1.0: state 7 ports 2 chg 0000 evt 0006 uhci_hcd 0000:00:07.2: port 1 portsc 01ab,00 hub 1-0:1.0: port 1, status 0301, change 0003, 1.5 Mb/s drivers/usb/core/inode.c: creating file '001' hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x301 usb 1-1: new low speed USB device using uhci_hcd and address 2 usb 1-1: skipped 1 descriptor after interface usb 1-1: skipped 1 descriptor after interface usb 1-1: default language 0x0409 usb 1-1: new device strings: Mfr=1, Product=2, SerialNumber=0 usb 1-1: Product: PS2 to USB Converter usb 1-1: Manufacturer: CHESEN usb 1-1: uevent usb 1-1: configuration #1 chosen from 1 choice usb 1-1: adding 1-1:1.0 (config #1, interface 0) usb 1-1:1.0: uevent usbhid 1-1:1.0: usb_probe_interface usbhid 1-1:1.0: usb_probe_interface - got id input: CHESEN PS2 to USB Converter as /class/input/input15 input: USB HID v1.10 Keyboard [CHESEN PS2 to USB Converter] on usb-0000:00:07.2-1 usb 1-1: adding 1-1:1.1 (config #1, interface 1) usb 1-1:1.1: uevent usbhid 1-1:1.1: usb_probe_interface usbhid 1-1:1.1: usb_probe_interface - got id input: CHESEN PS2 to USB Converter as /class/input/input16 input: USB HID v1.10 Mouse [CHESEN PS2 to USB Converter] on usb-0000:00:07.2-1 drivers/usb/core/inode.c: creating file '002' uhci_hcd 0000:00:07.2: port 2 portsc 009b,00 hub 1-0:1.0: port 2, status 0101, change 0003, 12 Mb/s hub 1-0:1.0: debounce: port 2: total 100ms stable 100ms status 0x101 usb 1-2: new full speed USB device using uhci_hcd and address 3 usb 1-2: ep0 maxpacket = 8 usb 1-2: default language 0x0409 usb 1-2: new device strings: Mfr=1, Product=2, SerialNumber=0 usb 1-2: Product: Generic USB Hub usb 1-2: Manufacturer: ALCOR usb 1-2: uevent usb 1-2: configuration #1 chosen from 1 choice usb 1-2: adding 1-2:1.0 (config #1, interface 0) usb 1-2:1.0: uevent hub 1-2:1.0: usb_probe_interface hub 1-2:1.0: usb_probe_interface - got id hub 1-2:1.0: USB hub found hub 1-2:1.0: 4 ports detected hub 1-2:1.0: standalone hub hub 1-2:1.0: individual port power switching hub 1-2:1.0: individual port over-current protection hub 1-2:1.0: power on to power good time: 44ms hub 1-2:1.0: local power source is good hub 1-2:1.0: enabling power on all ports drivers/usb/core/inode.c: creating file '003' hub 2-0:1.0: state 7 ports 2 chg 0000 evt 0006 uhci_hcd 0000:00:07.3: port 1 portsc 018a,00 hub 2-0:1.0: port 1, status 0300, change 0003, 1.5 Mb/s hub 2-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x300 uhci_hcd 0000:00:07.3: port 2 portsc 008a,00 hub 2-0:1.0: port 2, status 0100, change 0003, 12 Mb/s hub 2-0:1.0: debounce: port 2: total 100ms stable 100ms status 0x100 hub 1-0:1.0: state 7 ports 2 chg 0000 evt 0004 hub 1-2:1.0: state 7 ports 4 chg 0000 evt 0006 hub 1-2:1.0: port 1, status 0101, change 0001, 12 Mb/s hub 1-2:1.0: debounce: port 1: total 100ms stable 100ms status 0x101 usb 1-2.1: new full speed USB device using uhci_hcd and address 4 usb 1-2.1: ep0 maxpacket = 8 usb 1-2.1: default language 0x0409 usb 1-2.1: new device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-2.1: Product: USB HS SERIAL CONVERTER usb 1-2.1: Manufacturer: FTDI usb 1-2.1: SerialNumber: FTCEUPT7 usb 1-2.1: uevent usb 1-2.1: configuration #1 chosen from 1 choice usb 1-2.1: adding 1-2.1:1.0 (config #1, interface 0) usb 1-2.1:1.0: uevent usbserial_generic 1-2.1:1.0: usb_probe_interface usbserial_generic 1-2.1:1.0: usb_probe_interface - got id ftdi_sio 1-2.1:1.0: usb_probe_interface ftdi_sio 1-2.1:1.0: usb_probe_interface - got id ftdi_sio 1-2.1:1.0: FTDI USB Serial Device converter detected drivers/usb/serial/ftdi_sio.c: Detected FT232BM usb 1-2.1: FTDI USB Serial Device converter now attached to ttyUSB0 drivers/usb/core/inode.c: creating file '004' hub 1-2:1.0: port 2, status 0101, change 0001, 12 Mb/s hub 1-2:1.0: debounce: port 2: total 100ms stable 100ms status 0x101 usb 1-2.2: new full speed USB device using uhci_hcd and address 5 usb 1-2.2: ep0 maxpacket = 8 usb 1-2.2: default language 0x0409 usb 1-2.2: new device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-2.2: Product: USB HS SERIAL CONVERTER usb 1-2.2: Manufacturer: FTDI usb 1-2.2: SerialNumber: FTCEUPTD usb 1-2.2: uevent usb 1-2.2: configuration #1 chosen from 1 choice usb 1-2.2: adding 1-2.2:1.0 (config #1, interface 0) usb 1-2.2:1.0: uevent usbserial_generic 1-2.2:1.0: usb_probe_interface usbserial_generic 1-2.2:1.0: usb_probe_interface - got id ftdi_sio 1-2.2:1.0: usb_probe_interface ftdi_sio 1-2.2:1.0: usb_probe_interface - got id ftdi_sio 1-2.2:1.0: FTDI USB Serial Device converter detected drivers/usb/serial/ftdi_sio.c: Detected FT232BM usb 1-2.2: FTDI USB Serial Device converter now attached to ttyUSB1 drivers/usb/core/inode.c: creating file '005' hub 2-0:1.0: state 7 ports 2 chg 0000 evt 0000 hub 1-2:1.0: state 7 ports 4 chg 0000 evt 0004 usb usb2: suspend_rh (auto-stop) And now dmesg for the power-up remote end and hang: hub 1-0:1.0: state 7 ports 2 chg 0000 evt 0004 uhci_hcd 0000:00:07.2: port 2 portsc 019b,00 hub 1-0:1.0: port 2, status 0301, change 0003, 1.5 Mb/s usb 1-2: USB disconnect, address 3 usb 1-2.1: USB disconnect, address 4 usb 1-2.1: usb_disable_device nuking all URBs uhci_hcd 0000:00:07.2: shutdown urb d82d2920 pipe c0408480 ep1in-bulk usb 1-2.1: unregistering interface 1-2.1:1.0 usbdev1.4_ep81: ep_device_release called for usbdev1.4_ep81 usbdev1.4_ep02: ep_device_release called for usbdev1.4_ep02 ftdi_sio 1-2.1:1.0: device disconnected usb 1-2.1:1.0: uevent usb 1-2.1: unregistering device usbdev1.4_ep00: ep_device_release called for usbdev1.4_ep00 usb 1-2.1: uevent usb 1-2.2: USB disconnect, address 5 usb 1-2.2: usb_disable_device nuking all URBs usb 1-2.2: unregistering interface 1-2.2:1.0 usbdev1.5_ep81: ep_device_release called for usbdev1.5_ep81 usbdev1.5_ep02: ep_device_release called for usbdev1.5_ep02 ftdi_sio ttyUSB1: FTDI USB Serial Device converter now disconnected from ttyUSB1 ftdi_sio 1-2.2:1.0: device disconnected usb 1-2.2:1.0: uevent usb 1-2.2: unregistering device usbdev1.5_ep00: ep_device_release called for usbdev1.5_ep00 usb 1-2.2: uevent usb 1-2: usb_disable_device nuking all URBs uhci_hcd 0000:00:07.2: shutdown urb dd7f4740 pipe 40408380 ep1in-intr usb 1-2: unregistering interface 1-2:1.0 usbdev1.3_ep81: ep_device_release called for usbdev1.3_ep81 usb 1-2:1.0: uevent usb 1-2: unregistering device usbdev1.3_ep00: ep_device_release called for usbdev1.3_ep00 usb 1-2: uevent hub 1-0:1.0: debounce: port 2: total 100ms stable 100ms status 0x301 usb 1-2: new full speed USB device using uhci_hcd and address 6 usb 1-2: khubd timed out on ep0in len=-8/64 usb 1-2: khubd timed out on ep0in len=-8/64 usb 1-2: khubd timed out on ep0in len=-8/64 drivers/usb/serial/ftdi_sio.c: error from flowcontrol urb drivers/usb/serial/ftdi_sio.c: update_mctrl Error from MODEM_CTRL urb: DTR LOW, RTS LOW ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0 usb 1-2: device descriptor read/64, error -110 usb 1-2: khubd timed out on ep0in len=-8/64 Thanks for your time on this. 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