Cannot capture image and download with Sony A7R4, libgphoto2 2.5.29

Hello,

We are trying to get the Sony A7R4 up and running over at the Internet Archive with our digitization systems, but we are unable to get it to capture-image-and-download on Ubuntu 18.04.6. We are using libgphoto2 2.5.29 because it looks like that's where a previously reported A7R4 bug was fixed, but it is not working for us. Here is a summary of the debug output (full output linked below).

0.000208 main                        (2): ALWAYS INCLUDE THE FOLLOWING LINES WHEN SENDING DEBUG MESSAGES TO THE MAILING LIST:
0.000282 main                        (2): gphoto2 2.5.28
0.000299 main                        (2): gphoto2 has been compiled with the following options:
0.000309 main                        (2):  + gcc (C compiler used)
0.000318 main                        (2):  + popt (mandatory, for handling command-line parameters)
0.000327 main                        (2):  + exif (for displaying EXIF information)
0.000335 main                        (2):  + cdk (for accessing configuration options)
0.000344 main                        (2):  + aa (for displaying live previews)
0.000353 main                        (2):  + jpeg (for displaying live previews in JPEG format)
0.000361 main                        (2):  + readline (for easy navigation in the shell)
0.000372 main                        (2): libgphoto2 2.5.29
0.000383 main                        (2): libgphoto2 has been compiled with the following options:
0.000395 main                        (2):  + standard camlib set (ax203 canon digigr8 dimagev directory docupen jl2005a jl2005c kodak_dc240 lumix mars pentax ptp2 ricoh_g3 sierra sonix sq905 st2205 topfield tp6801)
0.000405 main                        (2):  + gcc (C compiler used)
0.000413 main                        (2):  + no ltdl (for portable loading of camlibs)
0.000422 main                        (2):  + EXIF (for special handling of EXIF files)
0.000432 main                        (2): libgphoto2_port 0.12.0
0.000444 main                        (2): libgphoto2_port has been compiled with the following options:
0.000453 main                        (2):  + iolibs: disk ptpip serial usb1 usbdiskdirect usbscsi
0.000462 main                        (2):  + gcc (C compiler used)
0.000471 main                        (2):  + no ltdl (for portable loading of iolibs)
0.000479 main                        (2):  + EXIF (for vusb)
0.000485 main                        (2):  + USB (libusb1, for USB cameras)
0.000491 main                        (2):  + serial (for serial cameras)
0.000496 main                        (2):  + no resmgr (serial port access and locking)
0.000502 main                        (2):  + no ttylock (serial port locking)
0.000508 main                        (2):  + no lockdev (serial port locking)
0.000514 main                        (2): CAMLIBS env var not set, using compile-time default instead
0.000520 main                        (2): IOLIBS env var not set, using compile-time default instead
0.000526 main                        (2): invoked with following arguments:
0.000532 main                        (2):   --capture-image-and-download
0.000538 main                        (2):   --debug
0.000546 main                        (2):   --debug-logfile
0.000555 main                        (2):   a7r4test.txt
0.000563 main                        (2):   --force-overwrite
0.000571 main                        (2):   --filename
0.000580 main                        (2):   a7r4test.jpg

The full debug output can be viewed here: https://archive.org/download/a7r4test/a7r4test.txt

Thanks in advance for any assistance.

Jude Coelho
Software Manager
Internet Archive