ModemManager Crushes after GPRS connection is established (MediaTek modem)

[Nikolay Morozov]

If i i exstablish a GPRS connection with my Phillips X620 (MediaTek chip), modemmnager crushes. syslog in attachment.

lspci -vvnn

00:1d.7 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB2 EHCI Controller [8086:27cc] (rev 01) (prog-if 20 [EHCI])
 Subsystem: Dell Device [1028:0201]
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin A routed to IRQ 20
 Region 0: Memory at ffa80000 (32-bit, non-prefetchable) [size=1K]
 Capabilities: <access denied>
 Kernel driver in use: ehci-pci

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: modemmanager 1.0.0-2ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
Uname: Linux 3.13.0-39-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CurrentDesktop: XFCE
Date: Fri Nov 7 22:24:02 2014
InstallationDate: Installed on 2014-04-07 (214 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
SourcePackage: modemmanager
UpgradeStatus: No upgrade log present (probably fresh install)