> > Redirecting stderr and stdout of 'lsusb -v' I get the following details.
> > Note: the device restart if it get probed with 'lsusb -v'
> >
> >
> > Bus 001 Device 011: ID 10d6:2200 Actions Semiconductor Co., Ltd
> > Device Descriptor:
> > bLength 18
> > bDescriptorType 1
> > bcdUSB 2.00
> > bDeviceClass 255 Vendor Specific Class
> > bDeviceSubClass 0
> > bDeviceProtocol 0
> > bMaxPacketSize0 64
> > idVendor 0x10d6 Actions Semiconductor Co., Ltd
> > idProduct 0x2200
>
> Notice how this is different from what appears when you left the device
> plugged in at boot time, earlier?
>
If it's already plugged at boot time it's registered as:
Bus 001 Device 002: ID 10d6:1101 Actions Semiconductor Co., Ltd
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x10d6 Actions Semiconductor Co., Ltd
idProduct 0x1101
bcdDevice 1.00
iManufacturer 0
iProduct 1 USB 2.0(HS) Flash Disk
iSerial 2 C621C804E79ACB41A8825E5C3BD13556
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 5 SFF-8070i
bInterfaceProtocol 80
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
// ------- END LSUSB -V -----------
Why 10d6:1101 instead of 10d6:2200 ????
The behavior is also different:
If the flash disk is already plugged at boot there is a kind of
constant sync between pc and the drive (with consequent load of
usb-storage debug messages, the animated icon on device display confirm this)
Most important thing: there is a /dev/sdb file to mount
Else the icon stand still, there's no usb-storage debug output and there's no
device in /dev to mount
> ...
> > Endpoint Descriptor:
> > bLength 7
> > bDescriptorType 5
> > bEndpointAddress 0x83 EP can't get device qualifier: No
> > such device
> > can't get debug descriptor: No such device
> > cannot read device status, No such device (19)
> > 3 IN
> > bmAttributes 3
> > Transfer Type Interrupt
> > Synch Type None
> > Usage Type Data
> > wMaxPacketSize 0x0040 1x 64 bytes
> > bInterval 200
> >
> > // ---------- END OF LSUSB -V --------------
> >
> > I guess something went wrong.
>
> Probably lsusb triggers that same firmware bug.
With the device already plugged lsusb doesn't trigger the bug
>
> > I put a rule in the udev rules directory:
> >
> > SUBSYSTEMS=="usb", ATTRS{idVendor}=="10d6",
> > ATTRS{idProduct}=="2200", KERNEL=="sd*",
> > GROUP="disk", MODE="0664", SYMLINK+="mp3_noblex"
> >
> > the symink point to usbdev1.12_ep83 that is a
> > character special and can't be mounted
Anyway I get rid of this udev rule for the moment
> I don't understand what wrong, but it's a udev problem rather than a
> kernel problem.
>
> Now that the device gets initialized correctly, does it actually work
> as it should?
If plugged after boot it appears to be stuck.
The right ID seems to be 10d6:1101 but it's recognized
only if the device is plugged since boot time.
Hoping for some good news,
cheers,
Fabio
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