Dear Kernel Developers, I had some trouble with my usb devices, often showing a disconnect problem. I did some googleing and saw, that it is a less or more common problem.
This problem is discussed in various internet sites. log from my machine: ############################# usb 4-6: new high speed USB device using ehci_hcd and address 7 usb 4-6: configuration #1 chosen from 1 choice hub 4-6:1.0: USB hub found hub 4-6:1.0: 4 ports detected usb 4-6.1: new full speed USB device using ehci_hcd and address 8 usb 4-6.1: device descriptor read/64, error -32 usb 4-6.1: device descriptor read/64, error -32 usb 4-6.1: new full speed USB device using ehci_hcd and address 9 usb 4-6.1: device descriptor read/64, error -110 usb 4-6.1: device descriptor read/64, error -110 usb 4-6.1: new full speed USB device using ehci_hcd and address 10 usb 4-6.1: device not accepting address 10, error -32 usb 4-6.1: new full speed USB device using ehci_hcd and address 11 usb 4-6.1: device not accepting address 11, error -71 usb 4-6: USB disconnect, address 7 usb 4-6: new high speed USB device using ehci_hcd and address 12 usb 4-6: configuration #1 chosen from 1 choice hub 4-6:1.0: USB hub found hub 4-6:1.0: 4 ports detected usb 4-6.1: new full speed USB device using ehci_hcd and address 13 usb 4-6.1: device descriptor read/64, error -32 usb 4-6.1: device descriptor read/64, error -32 usb 4-6.1: new full speed USB device using ehci_hcd and address 14 usb 4-6.1: device descriptor read/64, error -110 usb 4-6.1: device descriptor read/64, error -71 usb 4-6.1: new full speed USB device using ehci_hcd and address 15 usb 4-6.1: device not accepting address 15, error -71 usb 4-6.1: new full speed USB device using ehci_hcd and address 16 usb 4-6.1: device not accepting address 16, error -71 usb 4-6.1: new full speed USB device using ehci_hcd and address 17 usb 4-6.1: configuration #1 chosen from 1 choice SCSI subsystem initialized Initializing USB Mass Storage driver... scsi0 : SCSI emulation for USB Mass Storage devices usbcore: registered new driver usb-storage usb-storage: device found at 17 usb-storage: waiting for device to settle before scanning USB Mass Storage support registered. Vendor: Model: USB Card Reader Rev: 1.05 Type: Direct-Access ANSI SCSI revision: 00 Vendor: Model: USB Card Reader Rev: 1.05 Type: Direct-Access ANSI SCSI revision: 00 Vendor: Model: USB Card Reader Rev: 1.05 Type: Direct-Access ANSI SCSI revision: 00 Vendor: Model: USB Card Reader Rev: 1.05 Type: Direct-Access ANSI SCSI revision: 00 usb-storage: device scan complete sd 0:0:0:0: Attached scsi removable disk sda sd 0:0:0:1: Attached scsi removable disk sdb sd 0:0:0:2: Attached scsi removable disk sdc sd 0:0:0:3: Attached scsi removable disk sdd usb 4-6.1: reset full speed USB device using ehci_hcd and address 17 usb 4-6.1: reset full speed USB device using ehci_hcd and address 17 usb 4-6.1: reset full speed USB device using ehci_hcd and address 17 usb 4-6.1: reset full speed USB device using ehci_hcd and address 17 usb 4-6.1: reset full speed USB device using ehci_hcd and address 17 usb 4-6.1: reset full speed USB device using ehci_hcd and address 17 usb 4-6.1: reset full speed USB device using ehci_hcd and address 17 usb 4-6.1: reset full speed USB device using ehci_hcd and address 17 usb 4-6.1: USB disconnect, address 17 ######################### I have a solution/hint to solve this problem. In my case I had following NOT WORKING config: internal USB-Card PCI --> USB Hub --> Card Reader ( ali usb card, i-rocks hub, Phision cardreader) 00:08.0 USB Controller: ALi Corporation USB 1.1 Controller (rev 03) 00:08.1 USB Controller: ALi Corporation USB 1.1 Controller (rev 03) 00:08.2 USB Controller: ALi Corporation USB 1.1 Controller (rev 03) 00:08.3 USB Controller: ALi Corporation USB 2.0 Controller (rev 01) linux sets it up using: ehci --> ehci --> ehci (total usb 2.0 support) Bus 004 Device 028: ID 0d7d:0240 Phison Electronics Corp. I/O-Magic/Transcend 6-in-1 Card Reader Bus 004 Device 027: ID 05e3:0605 Genesys Logic, Inc. USB 2.0 Hub [ednet] but only the hub is a usb 2.0 compliant product. the card-reader is usb 1.1!! So i changed physically the hub back to a 1.1 device. and now linux sets this to ohci --> ohci --> ohci Bus 003 Device 011: ID 0d7d:0240 Phison Electronics Corp. I/O-Magic/Transcend 6-in-1 Card Reader Bus 003 Device 010: ID 03eb:3301 Atmel Corp. at43301 4-port Hub And this configuration works perfect, without any trouble any more. So in my opinion the problem is comming from ehci, which tries to set up a usb 1.1 device in a 2.0 mode. this results in severe timing problems, because the 1.1 device is too slow to handle this protocol, this results in a "dead" device from the point of view of the driver (no reaction). It disconnects the device and reconnects it again. It is only a problem, if you use a HUB between the USB Controller and the end device. I think we have to take care about the last device in the chain to set it up in the correct way. now log looks like this (and I am happy): ######################## usb 3-1: USB disconnect, address 8 ohci_hcd 0000:00:08.2: wakeup usb 3-2: new full speed USB device using ohci_hcd and address 9 usb 3-2: configuration #1 chosen from 1 choice drivers/usb/class/usblp.c: usblp0: USB Bidirectional printer dev 9 if 1 alt 0 proto 2 vid 0x03F0 pid 0x2D11 usbcore: registered new driver usblp drivers/usb/class/usblp.c: v0.13: USB Printer Device Class driver usb 3-1: new full speed USB device using ohci_hcd and address 10 usb 3-1: configuration #1 chosen from 1 choice hub 3-1:1.0: USB hub found hub 3-1:1.0: 4 ports detected usb 3-1.2: new full speed USB device using ohci_hcd and address 11 usb 3-1.2: configuration #1 chosen from 1 choice scsi2 : SCSI emulation for USB Mass Storage devices usb-storage: device found at 11 usb-storage: waiting for device to settle before scanning Vendor: Model: USB Card Reader Rev: 1.05 Type: Direct-Access ANSI SCSI revision: 00 sd 2:0:0:0: Attached scsi removable disk sda Vendor: Model: USB Card Reader Rev: 1.05 Type: Direct-Access ANSI SCSI revision: 00 sd 2:0:0:1: Attached scsi removable disk sdb Vendor: Model: USB Card Reader Rev: 1.05 Type: Direct-Access ANSI SCSI revision: 00 sd 2:0:0:2: Attached scsi removable disk sdc Vendor: Model: USB Card Reader Rev: 1.05 Type: Direct-Access ANSI SCSI revision: 00 sd 2:0:0:3: Attached scsi removable disk sdd usb-storage: device scan complete SCSI device sda: 510976 512-byte hdwr sectors (262 MB) sda: Write Protect is off sda: Mode Sense: 43 00 00 00 sda: assuming drive cache: write through SCSI device sda: 510976 512-byte hdwr sectors (262 MB) sda: Write Protect is off sda: Mode Sense: 43 00 00 00 sda: assuming drive cache: write through sda: sda1 ############################## I hope, that this will help you to work on this point. Chears & have a nice day. -- Wolfgang Schnitker - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
