gphoto consistently fails when connecting a Canon 40D via PTP on amd64 systems with an "Unspecified error".
This has been seen on 64-bit Ubuntu 12.04, 12.10, 13.04 (latest build as of 3/18/2013) on amd64 systems. It works fine on the same hardware with 32-bit Ubuntu.
The full log file for gphoto2 --debug --debug-logfile=gphoto.log -L has been attached.
Here is one of the setups that doesn't work:
Linux 3.2.0-39-generic #62-Ubuntu SMP Thu Feb 28 00:28:53 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
gphoto2 2.4.11 gcc, popt(m), exif, cdk, aa, jpeg, readline
libgphoto2 2.4.13 gcc, ltdl, EXIF
libgphoto2_port 0.8.0 gcc, ltdl, USB (libusb0), serial without locking
(Again, the problem persists on 13.04, which I believe is using gphoto2 2.5.1.)
A related bug in Launchpad for Ubuntu seems to be this: https://bugs.launchpad.net/ubuntu/+source/gimp/+bug/1094888
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