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I have a USB mobile modem that I connect it to USB-HUB with 4 ports. When I looked to it by using lsusb, it shows that :
Bus 008 Device 010: ID XXX:YYYY Huawei Technologies
Sometimes connection errors occures with it and when I looked by using dmesg it says :
[ 1712.511790] usb-storage 2-5.3:1.2: USB Mass Storage device detected
[ 1712.514737] scsi host11: usb-storage 2-5.3:1.2
[ 1713.530899] scsi 11:0:0:0: CD-ROM [OperatorName] USB SCSI CD-ROM 2.31 PQ: 0 ANSI: 2
[ 3073.831108] cdc_ether 2-5.3:1.0 enx[MAC]: unregister 'cdc_ether' usb-0000:00:1a.7-5.3, Huawei CDC Ethernet Device
[ 2575.631187] usb 2-5.3: reset high-speed USB device number 20 using ehci-pci
[ 303.445244] usbcore: registered new interface driver cdc_ether
[ 1698.629126] usb 2-5.4: USB disconnect, device number 10
[ 1698.631316] cdc_ether 2-5.4:1.0 enx[MAC]: unregister 'cdc_ether' usb-0000:00:1a.7-5.4, Huawei CDC Ethernet Device
[ 1710.889404] usb 2-5.3: new high-speed USB device number 11 using ehci-pci
[ 1711.001135] usb 2-5.3: unable to read config index 2 descriptor/start: -32
[ 1711.001140] usb 2-5.3: chopping to 2 config(s)
[ 1711.001143] usb 2-5.3: can't read configurations, error -32
[ 1711.085413] usb 2-5.3: new high-speed USB device number 12 using ehci-pci
[ 1711.197002] usb 2-5.3: unable to read config index 2 descriptor/start: -32
[ 1711.197006] usb 2-5.3: chopping to 2 config(s)
[ 1711.197009] usb 2-5.3: can't read configurations, error -32
[ 1711.201406] usb 2-5-port3: attempt power cycle
[ 1711.805404] usb 2-5.3: new high-speed USB device number 13 using ehci-pci
[ 1711.837126] usb 2-5.3: unable to read config index 2 descriptor/start: -32
[ 1711.837129] usb 2-5.3: chopping to 2 config(s)
[ 1711.837132] usb 2-5.3: can't read configurations, error -32
[ 1711.921401] usb 2-5.3: new high-speed USB device number 14 using ehci-pci
[ 1711.953253] usb 2-5.3: unable to read config index 2 descriptor/start: -32
[ 1711.953257] usb 2-5.3: chopping to 2 config(s)
[ 1711.953259] usb 2-5.3: can't read configurations, error -32
[ 1711.957406] usb 2-5-port3: unable to enumerate USB device
[ 1712.397404] usb 2-5.3: new high-speed USB device number 15 using ehci-pci
[ 1712.507005] usb 2-5.3: New USB device found, idVendor=VID, idProduct=PID, bcdDevice=f0.55
[ 1712.507009] usb 2-5.3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 1712.511686] cdc_ether 2-5.3:1.0 eth0: register 'cdc_ether' at usb-0000:00:1a.7-5.3, Huawei CDC Ethernet Device, [MAC]
[ 1712.511790] usb-storage 2-5.3:1.2: USB Mass Storage device detected
As you noticed that, I have some "frequently reset" problem with my usb modem. I want to ask questions :
1. why my Debian introduce USB modem as device as SCSI CD-ROM ? Is it related with Zero-CD feaure ot usb modems? I found similar problem in usb modem as SCSI. However, there is no clear solution/answer in step by step there(i.e just saying :
2. I have one power management installed in my OS : powertop , does that cause such a problem? I used problem since as you noticed from dmesg logs, In how to disable autosuspend webpage it says powertop can cause ausosuspend problem for usb devices. Does this cause frequent resets?
3. There are errors unable to read config index 2 descriptor/start: -32 & can't read configurations, error -32, what are they? How can I learn which code is represents what? I tried learn error codes but I could not find any file there. Is there any online documentation about these errors?
[Edited]
4. I also noticed that, when I unplug my modem from USB-HUB and directly connect it to a USB port of my computer, it disappears (although it blinks led light which shows it is working/signalling). How can I solve that problem too?
Thanks. Any help is appreciated.
Bus 008 Device 010: ID XXX:YYYY Huawei Technologies
Sometimes connection errors occures with it and when I looked by using dmesg it says :
[ 1712.511790] usb-storage 2-5.3:1.2: USB Mass Storage device detected
[ 1712.514737] scsi host11: usb-storage 2-5.3:1.2
[ 1713.530899] scsi 11:0:0:0: CD-ROM [OperatorName] USB SCSI CD-ROM 2.31 PQ: 0 ANSI: 2
[ 3073.831108] cdc_ether 2-5.3:1.0 enx[MAC]: unregister 'cdc_ether' usb-0000:00:1a.7-5.3, Huawei CDC Ethernet Device
[ 2575.631187] usb 2-5.3: reset high-speed USB device number 20 using ehci-pci
[ 303.445244] usbcore: registered new interface driver cdc_ether
[ 1698.629126] usb 2-5.4: USB disconnect, device number 10
[ 1698.631316] cdc_ether 2-5.4:1.0 enx[MAC]: unregister 'cdc_ether' usb-0000:00:1a.7-5.4, Huawei CDC Ethernet Device
[ 1710.889404] usb 2-5.3: new high-speed USB device number 11 using ehci-pci
[ 1711.001135] usb 2-5.3: unable to read config index 2 descriptor/start: -32
[ 1711.001140] usb 2-5.3: chopping to 2 config(s)
[ 1711.001143] usb 2-5.3: can't read configurations, error -32
[ 1711.085413] usb 2-5.3: new high-speed USB device number 12 using ehci-pci
[ 1711.197002] usb 2-5.3: unable to read config index 2 descriptor/start: -32
[ 1711.197006] usb 2-5.3: chopping to 2 config(s)
[ 1711.197009] usb 2-5.3: can't read configurations, error -32
[ 1711.201406] usb 2-5-port3: attempt power cycle
[ 1711.805404] usb 2-5.3: new high-speed USB device number 13 using ehci-pci
[ 1711.837126] usb 2-5.3: unable to read config index 2 descriptor/start: -32
[ 1711.837129] usb 2-5.3: chopping to 2 config(s)
[ 1711.837132] usb 2-5.3: can't read configurations, error -32
[ 1711.921401] usb 2-5.3: new high-speed USB device number 14 using ehci-pci
[ 1711.953253] usb 2-5.3: unable to read config index 2 descriptor/start: -32
[ 1711.953257] usb 2-5.3: chopping to 2 config(s)
[ 1711.953259] usb 2-5.3: can't read configurations, error -32
[ 1711.957406] usb 2-5-port3: unable to enumerate USB device
[ 1712.397404] usb 2-5.3: new high-speed USB device number 15 using ehci-pci
[ 1712.507005] usb 2-5.3: New USB device found, idVendor=VID, idProduct=PID, bcdDevice=f0.55
[ 1712.507009] usb 2-5.3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 1712.511686] cdc_ether 2-5.3:1.0 eth0: register 'cdc_ether' at usb-0000:00:1a.7-5.3, Huawei CDC Ethernet Device, [MAC]
[ 1712.511790] usb-storage 2-5.3:1.2: USB Mass Storage device detected
As you noticed that, I have some "frequently reset" problem with my usb modem. I want to ask questions :
1. why my Debian introduce USB modem as device as SCSI CD-ROM ? Is it related with Zero-CD feaure ot usb modems? I found similar problem in usb modem as SCSI. However, there is no clear solution/answer in step by step there(i.e just saying :
that is not so helpful).I would assume you could probably also set the configs to build udev and various other full-featured linux bits perhaps
2. I have one power management installed in my OS : powertop , does that cause such a problem? I used problem since as you noticed from dmesg logs, In how to disable autosuspend webpage it says powertop can cause ausosuspend problem for usb devices. Does this cause frequent resets?
3. There are errors unable to read config index 2 descriptor/start: -32 & can't read configurations, error -32, what are they? How can I learn which code is represents what? I tried learn error codes but I could not find any file there. Is there any online documentation about these errors?
[Edited]
4. I also noticed that, when I unplug my modem from USB-HUB and directly connect it to a USB port of my computer, it disappears (although it blinks led light which shows it is working/signalling). How can I solve that problem too?
Thanks. Any help is appreciated.
Last edited by a moderator: