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

On Thu, Aug 20, 2020 at 06:34:59PM +0200, [email protected] wrote:
> 
> 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)


It is the GVFS (Gnome Virtual Filesystem) that provides filesystem based
access to Nautilus and other parts of the GNOME Desktop.



Ciao, Marcus
 
> -------- 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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> 
> 
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> 

-- 
Marcus Meissner,SUSE LINUX GmbH; Maxfeldstrasse 5; D-90409 Nuernberg; Zi. 3.1-33,+49-911-740 53-432,,serv=loki,mail=wotan,type=real <[email protected]>