Public bug reported:
Binary package hint: linux-image
OS: Ubuntu 9.10 (Karmic Koala)
Kernel: 2.6.31-17-generic
I've got a PowerSync HU-210B USB 2.0 4-Port HUB, which is based on the
Alcor USB Hub chip (058f:6254 Alcor Micro Corp. USB Hub). After
performing Safely Remove Drive on a USB flash drive connected to this
hub, the USB port no longer reacts to plug/unplug events (gets stuck at
"suspend" status), until the hub itself is disconnected and reconnected
to the upstream.
Since the problem is not reproducible in Windows XP, I guess it's caused
by a bug in the linux-usb subsystem.
[code]
$ sudo lsusb -v -d 058f:6254
Bus 001 Device 019: ID 058f:6254 Alcor Micro Corp. USB Hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 1 Single TT
bMaxPacketSize0 64
idVendor 0x058f Alcor Micro Corp.
idProduct 0x6254 USB Hub
bcdDevice 1.00
iManufacturer 0
iProduct 1 USB2.0Hub
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0 Full speed (or root) hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 12
Hub Descriptor:
bLength 9
bDescriptorType 41
nNbrPorts 4
wHubCharacteristic 0x0080
Ganged power switching
Ganged overcurrent protection
TT think time 8 FS bits
Port indicators
bPwrOn2PwrGood 50 * 2 milli seconds
bHubContrCurrent 100 milli Ampere
DeviceRemovable 0x00
PortPwrCtrlMask 0xff
Hub Port Status:
Port 1: 0000.0507 highspeed power suspend enable connect
Port 2: 0000.0100 power
Port 3: 0000.0100 power
Port 4: 0000.0100 power
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 0 Full speed (or root) hub
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0001
Self Powered
[/code]
** Affects: linux-ports-meta (Ubuntu)
Importance: Undecided
Status: New
--
[058f:6254 Alcor Micro Corp. USB Hub] USB port gets stuck at "suspend" status
after Safely Remove Device
https://bugs.launchpad.net/bugs/514742
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