Fedora 22 and 23 don't (fully) recognize Canon camera; Fedora 20 and 21 did

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I have a Canon EOS SL1 camera (also known as an EOS 100D).  With Fedora
20 and 21, when I connected the camera to a USB port, it was recognized and
the KDE device notifier would ask whether I wanted to open it with the
file manager or download photos with digikam.  Digikam also recognized the
camera when it was connected.  The camera is supported by libghoto2 and
uses the PTP protocol.

But with Fedora 22 and 23, the camera is not fully recognized and I can't
download photos directly from the camera.  (I can use a card reader, of
course.)  In /var/log/messages, I see the following:

Nov 11 11:17:01 g kernel: usb 4-1.4.1: new high-speed USB device number 9
using ehci-pci Nov 11 11:17:02 g kernel: usb 4-1.4.1: New USB device
found, idVendor=04a9, idProduct=3270 
Nov 11 11:17:02 g kernel: usb
4-1.4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 Nov 11
11:17:02 g kernel: usb 4-1.4.1: Product: Canon Digital Camera 
Nov 11 11:17:02 g kernel: usb 4-1.4.1: Manufacturer: Canon Inc. 
Nov 11 11:17:02 g mtp-probe: checking bus 4, device 9:
"/sys/devices/pci0000:00/0000:00:1d.0/usb4/4-1/4-1.4/4-1.4.1" 
Nov 11 11:17:02 g mtp-probe: bus: 4, device: 9 was not an MTP device

The device notifier doesn't notice the camera (it says "no devices
available) and digikam can't see it. I've tried other cables and usb
ports (and even another computer). I use KDE, but this doesn't look like
it's a KDE issue.  

The only other camera with a usb connection thta I have at hand right now
is an old Canon Powershot G9, which gets similar messages about not being
an MTP device (but /var/log/messages shows a serial number for the camera).
This also worked with earlier Fedoras.

I'm not sure what changed from F21 to F22.  I was hoping that things would
work again with F23. Any suggestions?   I don't understand udev very
well...  

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