Fwd: Error attempting to get summary for Canon EOS 4000D: Error (-60: 'Could not lock the device')

Ok.

When I connect the camera via usb something (some aoutomount tool ?) 
detects it and presents a dialog box which has an option to "unmout".

When I press "unmout" instead of "OK" it seems gphoto2 can access the 
device.

This suggests there is some clash between the system trying to mount the 
device and gphoto2 trying to access it. I was thrown a little because 
there is no indication that the device actually gets mounted by the 
system (there is an entry in the log suggesting it tried and failed:
Aug 20 17:22:50 technoethical-t400s-b9d0 
org.gtk.vfs.GPhoto2VolumeMonitor[1336]: (process:1630): 
GVFS-GPhoto2-WARNING **: device (null) has no BUSNUM property, ignor
Aug 20 17:23:59 technoethical-t400s-b9d0 kernel: usb 2-1: USB 
disconnect, device number 15)

but it would seem even after failure the device remains locked. Without 
that dialog I would have no idea how to "unmount" it from the command 
line.

I don't suppose anyone knows what it is that attempts to mount the 
device, how it tries to mount it (does it assume mtp?) and why remains 
locked on ubuntu ? (probably one for a different forum, but thought I 
would ask)

-------- Original Message --------
Subject: [Gphoto-user] Error attempting to get summary for Canon EOS 
4000D: Error (-60: 'Could not lock the device')
Date: 20.08.2020 16:35
 From: [email protected]
To: [email protected]

Hi

I have just acquired a cannon EOS 4000D slr camera and wanted to use 
gphoto2 to connect to it.

My system:
cat /etc/*-rel*
DISTRIB_ID=Trisquel
DISTRIB_RELEASE=8.0
DISTRIB_CODENAME=flidas
DISTRIB_DESCRIPTION="Trisquel GNU/Linux 8.0, Flidas"
NAME="Trisquel GNU/Linux"
VERSION="8.0, Flidas"
ID=trisquel
ID_LIKE=debian
PRETTY_NAME="Trisquel GNU/Linux Flidas (8.0)"
VERSION_ID="8.0"
HOME_URL="https://trisquel.info/"
SUPPORT_URL="https://trisquel.info/wiki"
BUG_REPORT_URL="https://trisquel.info/project/issues"

$ uname -a
Linux technoethical-t400s-b9d0 4.19.139-gnu #1.0 SMP Tue Sep 27 12:35:59 
EST 1983 x86_64 x86_64 x86_64 GNU/Linux

-------------------------------

The default version of gphoto2 for my system is 2.5.9 and this did not 
include the 4000D in the supported list, so I downloaded the source for 
the latest versions of liggphoto2 (2.5.25) and gphoto2 (2.5.23), 
configured and built them.

This done I can plug the camera in and run:
$ gphoto2 --auto-detect
Model                          Port
----------------------------------------------------------
Canon EOS 4000D                usb:002,009

and it detects the camera fine.

However when I try to do anything with it I get the following:
$ gphoto2 --summary

*** Error ***
An error occurred in the io-library ('Could not lock the device'): 
Camera is already in use.
*** Error (-60: 'Could not lock the device') ***

For debugging messages, please use the --debug option.
Debugging messages may help finding a solution to your problem.
If you intend to send any error or debug messages to the gphoto
developer mailing list <[email protected]>, please run
gphoto2 as follows:

     env LANG=C gphoto2 --debug --debug-logfile=my-logfile.txt --summary

Please make sure there is sufficient quoting around the arguments.

Anyone any idea what is happening here ? My searches have shown other 
people have has similar messages, but I have not seen a solution for it.


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