** Description changed:
+ Clarification : this problem does not happen until the USB system gets itself
in a state I cannot reproduce. That state happens rarely, but once it does the
problems occurs often until the USB system is reinitialized.
+ (And as I point it out, rather than waiting that this bug be solved by
chance, it would be a good idea to send me some USB test procedure to find
where the problem lies when it happens again)
+
Using Ubuntu 8.04.1 on a Toshiba Tecra 8000 with USB hub shown below.
Often, when I plug a device to the hub, nothing happens.
This lasts as long as I decide (minutes).
Then I type the lsusb command, showing no device indeed.
That simple fact (issuing lsusb) connects the device.
A subsequent lsusb command shows the device connected.
More details available on request.
Contact welcome with developper to run tests.
Continue the excellent work.
Glad to contribute (wso,od).
André.
plug & wait 2 minutes :
$ lsusb
Bus 001 Device 021: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 001 Device 020: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 001 Device 001: ID 0000:0000
immediately :
$ lsusb
Bus 001 Device 022: ID 090c:1000 Feiya Technology Corp. Memory Bar
Bus 001 Device 021: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 001 Device 020: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 001 Device 001: ID 0000:0000
$
Bus 001 Device 001: ID 0000:0000
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 0 Full speed (or root) hub
bMaxPacketSize0 64
idVendor 0x0000
idProduct 0x0000
bcdDevice 2.06
Bus 001 Device 020: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 0 Full speed (or root) hub
bMaxPacketSize0 64
idVendor 0x05e3 Genesys Logic, Inc.
idProduct 0x0608 USB-2.0 4-Port HUB
--
usb device invisible until lsusb command issued
https://bugs.launchpad.net/bugs/263139
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