Re: [linux-usb-devel] ThinkPad T41 - Strange USB 2.0 behaviour

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Alan Stern wrote:
Robert, it would help somewhat if you could build a kernel with CONFIG_USB_DEBUG turned on and post the dmesg log showing what happens when you plug in one of those non-working devices. 
Sorry, yes I should have done that before...
Yes, in principle Linux can be made to switch over to full speed when high speed fails. But there are limitations: The switchover would work only for devices plugged directly into the computer, not for devices plugged into a high-speed hub. And some Linux systems (not regular PCs) have EHCI implementations that don't allow such a switch -- or if they do, I'm not aware of how to accomplish it.
Interesting, I have a USB 2.0 hub, but have not tried it, mainly because I need to find a power supply for it first. But regardless if the hub works as USB 2.0 or 1.1, it could be that another hub behaves differently, just like I have one USB 2.0 memory key that still works as such.
BTW, depending on the kind of failure the system does not keep retrying indefinitely. It gives up after four attempts. 

Alan Stern

***USB related boot messages with CONFIG_USB_DEBUG enabled
Jun 8 23:33:30 localhost kernel: USB Universal Host Controller Interface driver v3.0 Jun 8 23:33:30 localhost kernel: ACPI: PCI Interrupt 0000:00:1d.0[A] -> Link [LNKA] -> GSI 11 (level, low) -> IRQ 11 Jun 8 23:33:30 localhost kernel: uhci_hcd 0000:00:1d.0: UHCI Host Controller Jun 8 23:33:30 localhost kernel: uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 1 
Jun  8 23:33:30 localhost kernel: uhci_hcd 0000:00:1d.0: detected 2 ports
Jun 8 23:33:30 localhost kernel: uhci_hcd 0000:00:1d.0: irq 11, io base 0x00001800 
Jun  8 23:33:30 localhost kernel: usb usb1: Product: UHCI Host Controller
Jun 8 23:33:30 localhost kernel: usb usb1: Manufacturer: Linux 2.6.22-rc4 uhci_hcd 
Jun  8 23:33:30 localhost kernel: usb usb1: SerialNumber: 0000:00:1d.0
Jun 8 23:33:30 localhost kernel: usb usb1: configuration #1 chosen from 1 choice 
Jun  8 23:33:30 localhost kernel: hub 1-0:1.0: USB hub found
Jun  8 23:33:30 localhost kernel: hub 1-0:1.0: 2 ports detected
Jun 8 23:33:30 localhost kernel: ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 11 Jun 8 23:33:30 localhost kernel: ACPI: PCI Interrupt 0000:00:1d.1[B] -> Link [LNKD] -> GSI 11 (level, low) -> IRQ 11 Jun 8 23:33:30 localhost kernel: uhci_hcd 0000:00:1d.1: UHCI Host Controller Jun 8 23:33:30 localhost kernel: uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 2 
Jun  8 23:33:30 localhost kernel: uhci_hcd 0000:00:1d.1: detected 2 ports
Jun 8 23:33:30 localhost kernel: uhci_hcd 0000:00:1d.1: irq 11, io base 0x00001820 
Jun  8 23:33:30 localhost kernel: usb usb2: Product: UHCI Host Controller
Jun 8 23:33:30 localhost kernel: usb usb2: Manufacturer: Linux 2.6.22-rc4 uhci_hcd 
Jun  8 23:33:30 localhost kernel: usb usb2: SerialNumber: 0000:00:1d.1
Jun 8 23:33:31 localhost kernel: usb usb2: configuration #1 chosen from 1 choice 
Jun  8 23:33:31 localhost rpcbind: cannot create socket for udp6
Jun  8 23:33:31 localhost kernel: hub 2-0:1.0: USB hub found
Jun  8 23:33:31 localhost kernel: hub 2-0:1.0: 2 ports detected
Jun  8 23:33:31 localhost rpcbind: cannot create socket for tcp6
Jun 8 23:33:31 localhost kernel: ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 11 Jun 8 23:33:31 localhost kernel: ACPI: PCI Interrupt 0000:00:1d.2[C] -> Link [LNKC] -> GSI 11 (level, low) -> IRQ 11 Jun 8 23:33:31 localhost kernel: uhci_hcd 0000:00:1d.2: UHCI Host Controller Jun 8 23:33:31 localhost kernel: uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 3 
Jun  8 23:33:31 localhost kernel: uhci_hcd 0000:00:1d.2: detected 2 ports
Jun 8 23:33:31 localhost kernel: uhci_hcd 0000:00:1d.2: irq 11, io base 0x00001840 
Jun  8 23:33:31 localhost kernel: usb usb3: Product: UHCI Host Controller
Jun 8 23:33:31 localhost kernel: usb usb3: Manufacturer: Linux 2.6.22-rc4 uhci_hcd 
Jun  8 23:33:31 localhost kernel: usb usb3: SerialNumber: 0000:00:1d.2
Jun 8 23:33:31 localhost kernel: usb usb3: configuration #1 chosen from 1 choice 
Jun  8 23:33:31 localhost kernel: hub 3-0:1.0: USB hub found
Jun  8 23:33:31 localhost kernel: hub 3-0:1.0: 2 ports detected
Jun 8 23:33:31 localhost kernel: ACPI: PCI Interrupt Link [LNKH] enabled at IRQ 11 Jun 8 23:33:31 localhost kernel: ACPI: PCI Interrupt 0000:00:1d.7[D] -> Link [LNKH] -> GSI 11 (level, low) -> IRQ 11 Jun 8 23:33:31 localhost kernel: ehci_hcd 0000:00:1d.7: EHCI Host Controller Jun 8 23:33:31 localhost kernel: ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 4 
Jun  8 23:33:31 localhost kernel: ehci_hcd 0000:00:1d.7: debug port 1
Jun 8 23:33:31 localhost kernel: ehci_hcd 0000:00:1d.7: irq 11, io mem 0xc0000000 Jun 8 23:33:31 localhost kernel: ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004 
Jun  8 23:33:31 localhost kernel: usb usb4: Product: EHCI Host Controller
Jun 8 23:33:31 localhost kernel: usb usb4: Manufacturer: Linux 2.6.22-rc4 ehci_hcd 
Jun  8 23:33:31 localhost kernel: usb usb4: SerialNumber: 0000:00:1d.7
Jun 8 23:33:31 localhost kernel: usb usb4: configuration #1 chosen from 1 choice 
Jun  8 23:33:31 localhost kernel: hub 4-0:1.0: USB hub found

*** Plug USB 2.0 128MB memory key (with ehci-hcd loaded)
Jun 8 23:35:14 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 14 Jun 8 23:35:18 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 35 Jun 8 23:35:19 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 39 Jun 8 23:35:19 localhost kernel: ehci_hcd 0000:00:1d.7: port 4 reset error -110 Jun 8 23:35:19 localhost kernel: hub 4-0:1.0: hub_port_status failed (err = -32) Jun 8 23:35:19 localhost kernel: ehci_hcd 0000:00:1d.7: port 4 reset error -110 Jun 8 23:35:19 localhost kernel: hub 4-0:1.0: hub_port_status failed (err = -32) Jun 8 23:35:19 localhost kernel: hub 4-0:1.0: Cannot enable port 4. Maybe the USB cable is bad? Jun 8 23:35:19 localhost kernel: ehci_hcd 0000:00:1d.7: port 4 reset error -110 Jun 8 23:35:19 localhost kernel: hub 4-0:1.0: hub_port_status failed (err = -32) Jun 8 23:35:22 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 55 Jun 8 23:35:23 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 56 Jun 8 23:35:23 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 60 Jun 8 23:35:24 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 66 Jun 8 23:35:25 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 69 Jun 8 23:35:28 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 87 Jun 8 23:35:28 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 88 Jun 8 23:35:29 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 93 Jun 8 23:35:29 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 95 Jun 8 23:35:31 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 105 Jun 8 23:35:35 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 3 Jun 8 23:35:36 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 11 Jun 8 23:35:37 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 16 Jun 8 23:35:38 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 18 Jun 8 23:35:40 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 31 Jun 8 23:35:41 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 36 Jun 8 23:35:42 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 43 Jun 8 23:35:43 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 49 Jun 8 23:35:44 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 55 Jun 8 23:35:44 localhost kernel: ehci_hcd 0000:00:1d.7: port 4 reset error -110 Jun 8 23:35:44 localhost kernel: hub 4-0:1.0: hub_port_status failed (err = -32) Jun 8 23:35:45 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 58 Jun 8 23:35:46 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 59 Jun 8 23:35:50 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 87 Jun 8 23:35:51 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 92 Jun 8 23:35:52 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 99 Jun 8 23:35:53 localhost kernel: ehci_hcd 0000:00:1d.7: port 4 reset error -110 Jun 8 23:35:53 localhost kernel: hub 4-0:1.0: hub_port_status failed (err = -32) Jun 8 23:35:54 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 105 Jun 8 23:35:54 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 106 Jun 8 23:35:54 localhost kernel: ehci_hcd 0000:00:1d.7: port 4 reset error -110 Jun 8 23:35:54 localhost kernel: hub 4-0:1.0: hub_port_status failed (err = -32) Jun 8 23:35:56 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 112 Jun 8 23:35:58 localhost kernel: usb 4-4: new high speed USB device using ehci_hcd and address 122 

*** unplug USB key, rmmod ehci-hcd
Jun  8 23:36:26 localhost kernel: ehci_hcd 0000:00:1d.7: remove, state 4
Jun  8 23:36:26 localhost kernel: usb usb4: USB disconnect, address 1
Jun 8 23:36:26 localhost kernel: ehci_hcd 0000:00:1d.7: USB bus 4 deregistered Jun 8 23:36:26 localhost kernel: ACPI: PCI interrupt for device 0000:00:1d.7 disabled 

*** plug USB key (without ehci-hcd)
Jun 8 23:36:41 localhost kernel: usb 2-2: new full speed USB device using uhci_hcd and address 2 
Jun  8 23:36:41 localhost kernel: usb 2-2: Product: IBM USB Memory Key
Jun  8 23:36:41 localhost kernel: usb 2-2: Manufacturer: IBM
Jun 8 23:36:41 localhost kernel: usb 2-2: configuration #1 chosen from 1 choice 
Jun  8 23:36:41 localhost kernel: Initializing USB Mass Storage driver...
Jun 8 23:36:41 localhost kernel: scsi2 : SCSI emulation for USB Mass Storage devices Jun 8 23:36:41 localhost kernel: usbcore: registered new interface driver usb-storage 
Jun  8 23:36:41 localhost kernel: USB Mass Storage support registered.
Jun 8 23:36:46 localhost kernel: scsi 2:0:0:0: Direct-Access IBM Memory Key 1.01 PQ: 0 ANSI: 0 CCS Jun 8 23:36:46 localhost kernel: sd 2:0:0:0: [sdc] Attached SCSI removable disk Jun 8 23:36:46 localhost kernel: sd 2:0:0:0: Attached scsi generic sg2 type 0 Jun 8 23:36:47 localhost kernel: sd 2:0:0:0: [sdc] 256000 512-byte hardware sectors (131 MB) 
Jun  8 23:36:47 localhost kernel: sd 2:0:0:0: [sdc] Write Protect is off
Jun 8 23:36:47 localhost kernel: sd 2:0:0:0: [sdc] Assuming drive cache: write through Jun 8 23:36:47 localhost kernel: sd 2:0:0:0: [sdc] 256000 512-byte hardware sectors (131 MB) 
Jun  8 23:36:47 localhost kernel: sd 2:0:0:0: [sdc] Write Protect is off
Jun 8 23:36:47 localhost kernel: sd 2:0:0:0: [sdc] Assuming drive cache: write through 
Jun  8 23:36:47 localhost kernel:  sdc: sdc1
Jun  8 23:36:48 localhost hald: mounted /dev/sdc1 on behalf of uid 0

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