jockey-gtk crashed with DBusException in call_blocking()

[Para Siva]

The attached crash occurred when the display resolution was changed soon after the installation of 20130208 precise desktop amd64+mac image on a Mac min 5.1

The following are the steps involved.
1. Install precise desktop amd64+mac 20130208 as given in http://testcases.qa.ubuntu.com/Install/DesktopWhole but with no network support
2. Reboot and login afther the installation
3. Change the display resolution ( in the display that is used for this testing the change was from 1280x720 to 1366 x 768
4. The crash could be observed at this point and it can be reliably reproduced.
(The amd64 image and i386 image onother hardwares did NOT have this issue)

The crash file is attached (ubuntu-bug /var/crash/crashfile does not report this as a bug)

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: jockey-gtk 0.9.7-0ubuntu7.7
ProcVersionSignature: Ubuntu 3.5.0-23.35~precise1-generic 3.5.7.2
Uname: Linux 3.5.0-23-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
Date: Fri Feb 8 16:35:14 2013
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64+mac (20130208)
MachineType: Apple Inc. Macmini5,1
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-23-generic root=UUID=8a6f023d-150e-40c0-815f-8eca7bdf91ba ro quiet splash vt.handoff=7
SourcePackage: jockey
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/20/2011
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MM51.88Z.0077.B0F.1110201309
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-8ED6AF5B48C039E1
dmi.board.vendor: Apple Inc.
dmi.board.version: Macmini5,1
dmi.chassis.type: 16
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-8ED6AF5B48C039E1
dmi.modalias: dmi:bvnAppleInc.:bvrMM51.88Z.0077.B0F.1110201309:bd10/20/2011:svnAppleInc.:pnMacmini5,1:pvr1.0:rvnAppleInc.:rnMac-8ED6AF5B48C039E1:rvrMacmini5,1:cvnAppleInc.:ct16:cvrMac-8ED6AF5B48C039E1:
dmi.product.name: Macmini5,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

[dino99 (9d9)]

Jockey has been superseded by software-properties, which now handles
third-party driver configuration.