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SubjectRe: USB EHCI Problem with Low Speed Devices on kernel 2.6.11+
On Sat, 27 Aug 2005 15:43:11 +0200, Dominik Wezel <dio@qwasartech.com> wrote:

Forwarding to linux-usb-devel with comments.

> Kernel
> ======
> - 2.6.8, 2.6.11.10 and 2.6.12.4, all show same problem

> Problem
> =======
> When turning on the laptop and during POST and GrUB loading, all ports
> on the hub are enabled. During the USB initialization phase, when the
> hub is detected, shortly all ports become disabled, then turn on again
> (uhci_hcd detects the lo-speed ports). Upon initialization of ehci_hcd
> however, the ports are disconnected again (for good):
>
> ---8<----
> Aug 27 14:29:50 solaris kernel: ehci_hcd 0000:00:1d.7: USB 2.0
> initialized, EHCI 1.00, driver 10 Dec 2004
> Aug 27 14:29:50 solaris kernel: hub 4-0:1.0: USB hub found
> Aug 27 14:29:50 solaris kernel: hub 4-0:1.0: 6 ports detected
> Aug 27 14:29:50 solaris kernel: usb 2-1: USB disconnect, address 2
> Aug 27 14:29:50 solaris kernel: usb 2-1.5: USB disconnect, address 3
> Aug 27 14:29:50 solaris kernel: usb 2-1.6: USB disconnect, address 4
> ---8<----
>
> Addresses 2, 3 and 4 are a keyboard, mouse and palm sync cable respectively.
>
> and afterwards the log becomes cluttered with:
>
> ---8<----
> Aug 27 14:30:31 solaris kernel: usb 4-3: new high speed USB device using
> ehci_hcd and address 79
> Aug 27 14:30:31 solaris kernel: usb 4-3: device not accepting address
> 79, error -71
> Aug 27 14:30:32 solaris kernel: usb 4-3: new high speed USB device using
> ehci_hcd and address 81
> Aug 27 14:30:32 solaris kernel: usb 4-3: device not accepting address
> 81, error -71
> Aug 27 14:30:33 solaris kernel: usb 4-3: new high speed USB device using
> ehci_hcd and address 86
> Aug 27 14:30:34 solaris kernel: usb 4-3: device not accepting address
> 86, error -71
> Aug 27 14:30:34 solaris kernel: usb 4-3: new high speed USB device using
> ehci_hcd and address 89
> Aug 27 14:30:35 solaris kernel: usb 4-3: device not accepting address
> 89, error -71
> Aug 27 14:30:35 solaris kernel: usb 4-3: new high speed USB device using
> ehci_hcd and address 90
> Aug 27 14:30:35 solaris kernel: usb 4-3: device not accepting address
> 90, error -71
> ---8<----
>
> first address to be assigned was 30 in all logs, but the number raises
> mostly in increments of 2 till about 120, then restarts with 12.
>
> Interestlingly, the keyboard and mouse have been detected immediately
> before the intialization of ehcihcd:
>
> ---8<---
> Aug 27 14:29:50 solaris kernel: uhci_hcd 0000:00:1d.2: Intel Corp.
> 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3
> Aug 27 14:29:50 solaris kernel: PCI: Setting latency timer of device
> 0000:00:1d.2 to 64
> Aug 27 14:29:50 solaris kernel: uhci_hcd 0000:00:1d.2: irq 11, io base
> 0x1840
> Aug 27 14:29:50 solaris kernel: uhci_hcd 0000:00:1d.2: new USB bus
> registered, assigned bus number 3
> Aug 27 14:29:50 solaris kernel: hub 3-0:1.0: USB hub found
> Aug 27 14:29:50 solaris kernel: hub 3-0:1.0: 2 ports detected
> /* These are the 2 ports on the laptop */
> Aug 27 14:29:50 solaris kernel: usb 2-1: new full speed USB device using
> uhci_hcd and address 2
> Aug 27 14:29:50 solaris kernel: hub 2-1:1.0: USB hub found
> Aug 27 14:29:50 solaris kernel: hub 2-1:1.0: 7 ports detected
> /* These are the 7 ports of the external hub */
> Aug 27 14:29:50 solaris kernel: usb 2-1.5: new low speed USB device
> using uhci_hcd and address 3
> Aug 27 14:29:50 solaris kernel: usb 2-1.6: new low speed USB device
> using uhci_hcd and address 4
> Aug 27 14:29:50 solaris kernel: usbcore: registered new driver hiddev
> Aug 27 14:29:50 solaris kernel: input: USB HID v1.10 Mouse [Logitech
> Trackball] on usb-0000:00:1d.1-1.5
> Aug 27 14:29:50 solaris kernel: input: USB HID v1.10 Keyboard [CHICONY
> USB Keyboard] on usb-0000:00:1d.1-1.6
> Aug 27 14:29:50 solaris kernel: input,hiddev96: USB HID v1.10 Device
> [CHICONY USB Keyboard] on usb-0000:00:1d.1-1.6
> Aug 27 14:29:50 solaris kernel: usbcore: registered new driver usbhid
> Aug 27 14:29:50 solaris kernel: drivers/usb/input/hid-core.c: v2.0:USB
> HID core driver
> ---8<---
>
> which means the ehci_hcd has afterwards superseded uhci_hcd.
>
> Even more interestingly: in about 5% of the boot cases, ehci_hcd manages
> to detect the ports correctly (or at least doesn't interfere with uhci).

Curious.

> Measures taken
> ==============
> I've found an article suggesting to
> echo Y > /sys/module/usbcore/parameters/old_scheme_first

Very funny.

> ---
> I've also found articles suggesting to throw away the hub and get
> another one, which of course I can't take plain seriously, because now I
> know the problem of this hub, and I'm not going to change it for a hub
> whose problem I even don't know yet... =;)

Borrow one for testing.

Also, plug Palm directly into computer. Surely it has more than one
USB connector.

> Measures not taken
> ==================
> I didn't test the hub on Microsoft Windows, because I assume that
> wouldn't add to the solution space, since the problem is clearly located
> in the uhci_hcd vs. ehci_hcd domain of the linux kernel, as the hub is
> fully functional (within the lo speed scope) when used with only uhci.

Actually, I suspected that this may be a poorly working Transaction
Tranlating (TT) hub. Which then may work on certain versions of
Windows.

-- Pete
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