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Hi everybody,
I'm having problems with a USB-WLAN-Adapter (D-Link DWL-G122) . It used to run rather properly on a WinXP system most of the time. However, there were situations when booting failed with a black screen and i had to remove the stick manually to make the boot process continue.
After installing Arch Linux the device worked perfectly at first, but then it more and more frequently wouldn't be loaded at boot up.
The corresponding interface wlan0 then doesn't appear in ifconfig -a.
There is also a small chance that wlan0 appears after running the operating system for several minutes. If this is the case, it's possible to start it by ifconfig wlan0 up.
While wlan0 isn't loaded, dmesg prints out something like this in a loop:
...
hub 1-0:1.0: unable to enumerate USB device on port 1
usb 1-1: new high speed USB device using ehci_hcd and address 106
hub 1-0:1.0: unable to enumerate USB device on port 1
hub 1-0:1.0: unable to enumerate USB device on port 1
usb 1-1: new high speed USB device using ehci_hcd and address 108
hub 1-0:1.0: unable to enumerate USB device on port 1
hub 1-0:1.0: unable to enumerate USB device on port 1
usb 1-1: new high speed USB device using ehci_hcd and address 110
hub 1-0:1.0: unable to enumerate USB device on port 1
hub 1-0:1.0: unable to enumerate USB device on port 1
...
Whereas this is the end of a dmesg file when the usb device started working after a while:
...
hub 1-0:1.0: unable to enumerate USB device on port 1
hub 1-0:1.0: unable to enumerate USB device on port 1
hub 1-0:1.0: unable to enumerate USB device on port 1
hub 1-0:1.0: unable to enumerate USB device on port 1
usb 2-1: new full speed USB device using uhci_hcd and address 2
usb 2-1: not running at top speed; connect to a high speed hub
usb 2-1: configuration #1 chosen from 1 choice
As this problem occurs most of the time but not regularly, it is possibly a hardware error in the usb adapter (defective contact etc.), but since i'm new to linux i just wanted to be sure before spending money on a new wlan-adapter or card. Tell me what you think.
additional info:
what lsusb -v says about it (when it works)
Bus 002 Device 002: ID 2001:3c00 D-Link Corp. [hex] DWL-G122 802.11g rev. B1 [ralink]
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x2001 D-Link Corp. [hex]
idProduct 0x3c00 DWL-G122 802.11g rev. B1 [ralink]
bcdDevice 0.01
iManufacturer 1 ANI
iProduct 2 802.11g W
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 300mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 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)
Thanks in advance for any suggestions.
Last edited by t09l (2009-03-03 13:48:33)
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Some reports suggest that the current limit on USB devices for USB 2.0 cannot be supplied by the motherboard.
Perhaps something of this nature is affecting the performance. FWIW
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I had a similar problem with game controller. It was remedied by plugging the controller into a powered USB port in the back of the computer instead of one on the front panel.
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Thanks for your answers; i wasn't able to solve the problem, though (i.e. i get rarely any internet access, currently writing this from another pc). I'm pretty sure now the usb adapter is simply broken - i'll buy a new adapter / network card and see what happens.
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