Public bug reported:
Device: CECT mobile phone connected to USB as a "COM Port" (MT6227 USB to
Serial)
System: Ubuntu 7.04 Feisty Fawn
Kernel: 2.6.20-16-lowlatency
/var/log/syslog:
Aug 22 21:34:18 dunder kernel: [17297.141000] usb 2-2: new full speed USB
device using uhci_hcd and address 4
Aug 22 21:34:18 dunder kernel: [17297.311000] usb 2-2: configuration #1 chosen
from 1 choice
Aug 22 21:34:18 dunder kernel: [17297.317000] drivers/usb/class/cdc-acm.c: Zero
length descriptor references
Aug 22 21:34:18 dunder kernel: [17297.317000]
Aug 22 21:34:18 dunder kernel: [17297.317000] cdc_acm: probe of 2-2:1.1 failed
with error -22
Aug 22 21:34:18 dunder kernel: [17297.317000] usb 2-2: device_add(2-2:1.1) -->
-22
/dev/bus/usb/devices:
T: Bus=02 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 4 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=02(comm.) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0e8d ProdID=0003 Rev= 0.01
S: Manufacturer=MediaTek Inc
S: Product=MT6227
S: SerialNumber=531699100035140
C:* #Ifs= 2 Cfg#= 1 Atr=80 MxPwr=500mA
I: If#= 0 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=(none)
E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
E: Ad=01(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms
I: If#= 1 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=01 Driver=(none)
E: Ad=83(I) Atr=03(Int.) MxPS= 8 Ivl=1ms
lsusb:
Bus 002 Device 004: ID 0e8d:0003
I think it's kernel module fault.
** Affects: Ubuntu
Importance: Undecided
Status: New
** Tags: device kernel mobile modem mt6227 serial
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MT6227 USB to Serial fails to create /dev/ttyACM0
https://bugs.launchpad.net/bugs/134123
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