I have experienced this same problem since KDE-3.5 - not being able to
view the camera in konqueror as a regular user but can view and edit the
camera pictures when logged in a root and it has still become an issue
with KDE-4.10.5 so it has still not been resolved as of KDE4.10 and
Slackware14.1.  I have solved it this way.

My original configuration was KDE-4.10.5, libgphoto 2.5.2.  I installed
the camera thru System Settings - Digital Camera as a "Nikon D50 PTP"

I then downloaded the latest libgphoto2-2.5.7 and edited 
"camlibs/ptp2/library.c" and changed the appropriate line for my camera - line 
1054 as "Nikon:D50 ( PTP mode )" is changed to "Nikon:D50 PTP" so that this 
matches the KDE setting as close as possible and to reduce verbiage I changed 
line 2048 from "USB PTP Class Camera" to "USB PTP Camera".
Back to the top of the source tree
        ./configure --prefix=/usr --libdir=/usr/lib64   
so that the output code will overlay the original installed library.
       make, become superuser,  make install
I can now view the camera thru konqueror or dolphin as a regular user.  This is 
still probably a permissions problem and KDE and the distributors are not 
setting permissions correctly

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https://bugs.launchpad.net/bugs/1256591

Title:
  The system is unable to read from a PTP camera.

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