I've now ruled out kernel module usb_storage as the cause of the problem
and have found that usb_modeswitch is failing to read device information
even though lsusb shows me that the relevant information is available.
I'm not familiar with device naming, but I can't see how
/sys/bus/usb/devices/7-1:1.0 relates to the information I can get from
lsusb. In particular lsusb refers to 'Bus 007 Device 004' while
usb_modeswitch has been passed '7-1:1.0' by udev. Am I naïve in
expecting to see a '4' somewhere in the parameter passed by udev?
I removed usb-storage.ko (by renaming it to out of the kernel directory
tree), rebooted and tested both dongles. The K3520-Z behaved as before,
i.e. it failed to switch modes. The K-3770 still worked, but checking
udev debug output in syslog revealed that its mode was now being
switched by usb_modeswitch rather than by the kernel module usb_storage.
My next step was to enable debug output in usb_modeswitch. It produced
the following:
USB_ModeSwitch log from Fri May 10 17:48:11 2013
Using global config file: /etc/usb_modeswitch.conf
Raw args from udev: 7-1:1.0/7-1:1.0
Using top device dir /sys/bus/usb/devices/7-1:1.0
USB dir exists: /sys/bus/usb/devices/7-1:1.0
Warning: USB attribute "idVendor" not readable.
Warning: USB attribute "idProduct" not readable.
Warning: USB attribute "manufacturer" not readable.
Warning: USB attribute "product" not readable.
Warning: USB attribute "serial" not readable.
Warning: USB attribute "bNumConfigurations" not readable.
Warning: USB attribute "bConfigurationValue" not readable.
Warning: USB attribute "devnum" not readable.
Warning: USB attribute "busnum" not readable.
SCSI dir exists: /sys/bus/usb/devices/7-1:1.0
Warning: SCSI attribute "vendor" not readable.
Warning: SCSI attribute "model" not readable.
Warning: SCSI attribute "rev" not readable.
USB IDs not found in sysfs tree. Exiting.
So, basically usb_modeswitch (I think it's actually
usb_modeswitch_dispatcher but I could be wrong) is failing to get any
information about the device and hence can't look the device up in the
usb_modeswitch_data tarball to find out the actions necessary to switch
the mode.
The following is the output from lsusb --verbose -d 19d2:2000 and shows
that the information that usb_modeswitch can't read is in fact
available:
Bus 007 Device 004: ID 19d2:2000 ZTE WCDMA Technologies MSM
MF627/MF628/MF628+/MF636+ HSDPA/HSUPA
Couldn't open device, some information will be missing
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x19d2 ZTE WCDMA Technologies MSM
idProduct 0x2000 MF627/MF628/MF628+/MF636+ HSDPA/HSUPA
bcdDevice 0.00
iManufacturer 1
iProduct 2
iSerial 3
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk-Only
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x89 EP 9 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x09 EP 9 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1175093
Title:
K3520-Z mode not switched automatically
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1175093/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
