MT6227 USB to Serial fails to create /dev/ttyACM0

[dunDer]

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.

[Chuck Short (zulcss)]

Hi, Ive added the workaround for gutsy. its in my git tree right now will push soonish

[dunDer (dunder)]

I've just updated to Gutsy a minute ago, so I'm waiting for a workaround - thanks for help :)

[Tim Gardner (timg-tpi)]

Chuck - does your workaround apply to Gutsy?

[Chuck Short (zulcss)]

Yes I will be running some testbuilds when I get hoem tonight

[Tim Gardner (timg-tpi)]

Gutsy commit 2e1b0a4653a0d96c253782a9e9369125e59d9303

[Kyle McMartin (kyle)]

linux-source-2.6.22 (2.6.22-13.40) gutsy; urgency=low

  [Amit Kucheria]

  * Enable CONFIG_VM86 for LPIA
    - LP: #146311
  * Update configuration files
  * Disable MSI by default
  * Add mmconf documentation
  * Update configuration files

  [Bartlomiej Zolnierkiewicz]

  * ide-disk: workaround for buggy HPA support on ST340823A (take 3)
    - LP: #26119

  [Ben Collins]

  * ubuntu/cell: Fixup ps3 related modules for d-i, enable RTAS console
  * ubuntu/cell: Enable CELLEB and related modules (pata_scc)
  * ubuntu/cell: Move ps3rom to storage-core. Also use spidernet, not
    spider_net.
  * ubuntu/cell: Set PS3_MANAGER=y
  * ubuntu: Set NR_CPUS=256 for sparc64-smp

  [Chuck Short]

  * [USB] USB] Support for MediaTek MT6227 in cdc-acm.
    - LP: #134123
  * [XEN] Fix xen vif create with more than 14 guests.
    - LP: #14486

  [Jorge Juan Chico]

  * ide: ST320413A has the same problem as ST340823A
    - LP: #26119

  [Kyle McMartin]

  * fix -rt build
  * fix ia32entry-xen.S for CVE-2007-4573
  * fix build when CONFIG_PCI_MSI is not set

  [Matthew Garrett]

  * hostap: send events on data interface as well as master interface
    - LP: #57146
  * A malformed _GTF object should not prevent ATA device recovery
    - LP: #139079
  * hostap: send events on data interface as well as master interface
    - LP: #57146
  * A malformed _GTF object should not prevent ATA device recovery
    - LP: #139079
  * Don't lose appletouch button release events
  * Fix build with appletouch change
  * Disable Thinkpad backlight support on machines with ACPI video
    - LP: #148055
  * Don't attempt to register a callback if there is no CMOS object
    - LP: #145857
  * Update ACPI bay hotswap code to support locking
    - LP: #148219
  * Update ACPI bay hotswap code to support locking
    - LP: #148219
  * Don't attempt to register a callback if there is no CMOS object
    - LP: #145857
  * Disable Thinkpad backlight support on machines with ACPI video
    - LP: #148055

  [Steffen Klassert]

  * 3c59x: fix duplex configuration
    - LP: #94186

  [Thomas Gleixner]

  * clockevents: remove the suspend/resume workaround^Wthinko

  [Tim Gardner]

  * orinoco_cs.ko missing
    - LP: #125832
  * Marvell Technology ethernet card not recognized and not operational
    - LP: #135316
  * Marvell Technology ethernet card not recognized and not operational
    - LP: #135316
  * acpi_scan_rsdp() breaks some PCs by not honouring ACPI specification
    - LP: #144336
  * VIA southbridge Intel id missing
    - LP: #128289
  * Add T-Sinus 111card to hostap_cs driver to be able to upload firmware
    - LP: #132466
  * RTL8111 PCI Express Gigabit driver r8169 big files produce slow file
    transfer
    - LP: #114171
  * Guest OS does not recognize a lun with non zero target id on Vmware ESX
    Server
    - LP: #140761
  * Modualrize vesafb
    - LP: #139505
  * Nikon cameras need support in unusual_devs.h
    - LP: #134477
  * agp for i830m broken in gutsy
    - LP: #139767
  * hdaps: Added support for Thinkpad T61
    - LP: #147383
  * xen: Update config for i386
    - LP: #139047
  * xen: resync for amd64
    - LP: #139047
  * ide-disk: workaround for buggy HPA support ...

[Launchpad Janitor (janitor)]

Per a decision made by the Ubuntu Kernel Team, bugs will longer be assigned to the ubuntu-kernel-team in Launchpad as part of the bug triage process. The ubuntu-kernel-team is being unassigned from this bug report. Refer to https://wiki.ubuntu.com/KernelTeamBugPolicies for more information. Thanks.