[PLUG] Communicating with digital camera via USB

[King Beowulf]

On 6/23/20 8:21 AM, Rich Shepard wrote:
> I have a Canon EOS Rebel T3 digital camera and just purchased a USB cable
> that is supposed to work with this model. When I connect the camera to a
> USB
> port on the desktop /var/log/messages reports:
> 
> Jun 23 08:05:32 salmo kernel: [1090432.979576] usb 1-14: new high-speed
> USB device number 60 using xhci_hcd
> Jun 23 08:05:32 salmo kernel: [1090433.187069] usb 1-14: New USB device
> found, idVendor=04a9, idProduct=3217, bcdDevice= 0.02
> Jun 23 08:05:32 salmo kernel: [1090433.187070] usb 1-14: New USB device
> strings: Mfr=1, Product=2, SerialNumber=0
> Jun 23 08:05:32 salmo kernel: [1090433.187071] usb 1-14: Product: Canon
> Digital Camera
> Jun 23 08:05:32 salmo kernel: [1090433.187072] usb 1-14: Manufacturer:
> Canon Inc.
> Jun 23 08:05:32 salmo mtp-probe: checking bus 1, device 60:
> "/sys/devices/pci0000:00/0000:00:01.3/0000:01:00.0/usb1/1-14" Jun 23
> 08:05:32 salmo mtp-probe: bus: 1, device: 60 was not an MTP device Jun
> 23 08:05:55 salmo kernel: [1090455.623438] usb 1-14: USB disconnect,
> device number 60
> 
> I just learned that MTP is Media Transfer Protocol and apparently
> Slackware-14.2 supports it, recognizes the camera, but cannot
> communicate with it. My web searches for how to use the Canon USB cable
> with
> linux found only one unanswered question from a couple of years ago.
> 

Rich,

Actually, Slackware spots a USB device that does not report as a true
(and simple) mass storage and guesses MTP and then fails because the
device is NOT an MTP device. This could be true, or it could be that the
Slackware 14.2 libraries are too old, or the camera is using an odd
version of MTP, or the USB port is too slow.

You can also try a different USB port - not all are created equal.

Canon cameras are supported via gphoto.  Slackware has libgphoto2-2.5.10
and gphoto2-2.5.10 that support the Canon Rebel T3 (no EOS?)
http://gphoto.org/proj/libgphoto2/support.php

try:

$ gphoto2 --auto-detect





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