Messages in this thread | | | Date | Sat, 27 Aug 2005 10:21:35 -0700 | From | Pete Zaitcev <> | Subject | Re: USB EHCI Problem with Low Speed Devices on kernel 2.6.11+ |
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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.
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