Error -114 or -102 when reading from Canon EOS 5D

[Bruno Girin]

gphoto2 reports errors when reading from my Canon EOS 5D. This used to work well prior to upgrading to Precise.

Steps to reproduce:
1. Connect the camera to the computer and switch it on,
2. If Shotwell starts, stop it immediately (you might have to force it to quit),
3. Run the following command:
gphoto2 --debug --list-files
4. gphoto2 reports error -114: 'OS error in camera communication'
5. Re-run the same command a few minutes later
6. gphoto2 reports error -102: 'Corrupted data'

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gphoto2 2.4.11-2
ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
Date: Thu Jun 7 12:15:03 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901)
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: gphoto2
UpgradeStatus: Upgraded to precise on 2012-02-11 (116 days ago)

[Bruno Girin (brunogirin)]

Initial output of gphoto2 --debug --list-files

[Bruno Girin (brunogirin)]

Subsequent output of gphoto2 --debug --list-files