Nikon 1 J3 exposure time not correct

[HaraldStauss]

Describe the bug

gphoto2 correctly detects the Nikon 1 J3 camera. It also sets the exposure time correctly using:
gphoto2 --set-config Shutterspeed=15
This sets the exposure time to 15 seconds (confirmed on camera display)
After that:
gphoto2 --capture-image
takes an image but only with an exposure time of less than 1 second.

Name the camera
If this is camera specific, include the camera name as shown by gphoto2 --auto-detect or USB IDs
Model Port

Nikon J3 usb:001,010

libgphoto2 and gphoto2 version
output of: gphoto2 --version
gphoto2 2.5.28

Copyright (c) 2000-2021 Marcus Meissner and others

gphoto2 comes with NO WARRANTY, to the extent permitted by law. You may
redistribute copies of gphoto2 under the terms of the GNU General Public
License. For more information about these matters, see the files named COPYING.

This version of gphoto2 is using the following software versions and options:
gphoto2 2.5.28 gcc, popt(m), exif, cdk, aa, jpeg, readline
libgphoto2 2.5.30 standard camlibs, gcc, no ltdl, EXIF
libgphoto2_port 0.12.1 iolibs: disk ptpip serial usb1 usbdiskdirect usbscsi, gcc, no ltdl, EXIF, USB, serial without locking

To Reproduce
Steps to reproduce the behavior:

1. connect camera to USB port
2. gphoto2 --set-config Shutterspeed=15
3. gphoto2 --capture-image

If its a camera misbehavior, attach debug output using --debug --debug-logfile=debug.log (if considered useful).
Nikon_J3_Debug.txt

Thank you for looking into this.

Harald Stauss

[msmeissn]

tracked in libgphoto2 space