No tethering in Darktable - Nikon D750 - M mode - manual

Hello, I have a Nikon D750 and when I try tethering, when I set the Nikon to S - time priority, and A - aperture priority, everything is OK. But as soon as I set the Nikon to manual mode, Darktable crashes.
Method:

  1. I connect the Nikon D750 to USB in the laptop and turn it on
  2. I start Darktable
  3. In the import, I select tethering for images under the Nikon D750
  4. Darktable crashes

In modes A, S, tethering starts and everything goes as it should.

I am attaching the outputs:

Tests from the command line:
Pepa@linux-acer:~> env LANG=C gphoto2 --auto-detect #1
Model Port

Nikon DSC D750 usb:006,013
Pepa@linux-acer:> env LANG=C gphoto2 --port usb: --abilities #2
Abilities for camera : Nikon DSC D750
Serial port support : no
USB support : yes
Capture choices :
: Image
: Preview
: Trigger Capture
Configuration support : yes
Delete selected files on camera : yes
Delete all files on camera : no
File preview (thumbnail) support : yes
File upload support : yes
Pepa@linux-acer:
> env LANG=C gphoto2 --port usb: --capture-image-and-download #3
New file is in location /capt0000.nef on the camera
Saving file as capt0000.nef
Deleting file /capt0000.nef on the camera
Pepa@linux-acer:~> env LANG=C gphoto2 --port usb: --capture-tethered #4
Waiting for events from camera. Press Ctrl-C to abort.
UNKNOWN PTP Property d1a6 changed
UNKNOWN PTP Property d0b5 changed
UNKNOWN PTP Property d105 changed
UNKNOWN PTP Property d105 changed
UNKNOWN PTP Property d1b4 changed
UNKNOWN PTP Property d1f1 changed
Saving file as SJS_4067.NEF
CAPTURECOMPLETE
UNKNOWN PTP Property d0b5 changed
UNKNOWN PTP Property d1b4 changed
UNKNOWN PTP Property d1f1 changed
UNKNOWN PTP Property d0b5 changed
UNKNOWN PTP Property d0b5 changed
UNKNOWN PTP Property d0b5 changed
UNKNOWN PTP Property d0b5 changed
^C
Cancelling…
#########################################

camctl.log:
3,165753 [camera_control] creating new context 0x3a2b020
3,205851 [camera_control] loaded 2561 camera drivers.
4,419241 [camera_control] loaded 37 port drivers.
4,492164 [camera_control] 1 cameras connected
4,492262 [camera_control] found new Nikon DSC D750 on port usb:006,013

######################################################################
gphoto2_debug.log:
0.000043 main (2): ALWAYS INCLUDE THE FOLLOWING LINES WHEN SENDING DEBUG MESSAGES TO THE MAILING LIST:
0.000191 main (2): gphoto2 2.5.28
0.000269 main (2): gphoto2 has been compiled with the following options:
0.000364 main (2): + gcc (C compiler used)
0.000435 main (2): + popt (mandatory, for handling command-line parameters)
0.002169 main (2): + exif (for displaying EXIF information)
0.002336 main (2): + cdk (for accessing configuration options)
0.002409 main (2): + no aa (for displaying live previews)
0.002477 main (2): + jpeg (for displaying live previews in JPEG format)
0.002542 main (2): + readline (for easy navigation in the shell)
0.002610 main (2): libgphoto2 2.5.27
0.002682 main (2): libgphoto2 has been compiled with the following options:
0.002752 main (2): + standard camlib set SKIPPING SOME (ax203 canon digigr8 dimagev directory docupen jl2005a jl2005c kodak_dc240 mars pentax ptp2 ricoh_g3 sierra sonix sq905 st2205 topfield tp6801 SKIPPING lumix)
0.002819 main (2): + gcc (C compiler used)
0.002888 main (2): + ltdl (for portable loading of camlibs)
0.002954 main (2): + EXIF (for special handling of EXIF files)
0.003074 main (2): libgphoto2_port 0.12.0
0.003713 main (2): libgphoto2_port has been compiled with the following options:
0.003792 main (2): + iolibs: disk ptpip serial usb1 usbdiskdirect usbscsi
0.003858 main (2): + gcc (C compiler used)
0.003922 main (2): + ltdl (for portable loading of iolibs)
0.003987 main (2): + EXIF (for vusb)
0.004052 main (2): + USB (libusb1, for USB cameras)
0.004116 main (2): + serial (for serial cameras)
0.004180 main (2): + no resmgr (serial port access and locking)
0.004245 main (2): + no ttylock (serial port locking)
0.004312 main (2): + lockdev (serial port locking)
0.004379 main (2): CAMLIBS env var not set, using compile-time default instead
0.004443 main (2): IOLIBS env var not set, using compile-time default instead
0.004510 main (2): invoked with following arguments:
0.004579 main (2): --debug
0.004643 main (2): --debug-logfile=gphoto2_debug.log
0.004774 load_settings (2): Creating gphoto config directory (‘/home/Pepa/.gphoto’)
0.004997 load_settings (2): Loading settings from file ‘/home/Pepa/.gphoto/settings’.
0.005443 gp_camera_free (2): Freeing camera…
0.005522 gp_port_free (2): Freeing port…
0.005593 gp_filesystem_reset (2): resetting filesystem
0.005659 gp_filesystem_lru_clear (2): Clearing fscache LRU list…
0.005724 gp_filesystem_lru_clear (2): fscache LRU list already empty
0.005789 delete_all_folders (2): Internally deleting all folders from ‘/’…
0.005856 lookup_folder (2): Lookup folder ‘/’…
0.005957 lookup_folder (2): Found! / is 0x55f386c936b0
0.006028 recurse_delete_folder (2): Recurse delete folder 0x55f386c936b0//
0.006094 delete_all_files (2): Delete all files in folder 0x55f386c936b0//
0.000042 main (2): ALWAYS INCLUDE THE FOLLOWING LINES WHEN SENDING DEBUG MESSAGES TO THE MAILING LIST:
0.000282 main (2): gphoto2 2.5.28
0.000360 main (2): gphoto2 has been compiled with the following options:
0.000435 main (2): + gcc (C compiler used)
0.000503 main (2): + popt (mandatory, for handling command-line parameters)
0.000609 main (2): + exif (for displaying EXIF information)
0.000677 main (2): + cdk (for accessing configuration options)
0.000746 main (2): + no aa (for displaying live previews)
0.000814 main (2): + jpeg (for displaying live previews in JPEG format)
0.000879 main (2): + readline (for easy navigation in the shell)
0.000945 main (2): libgphoto2 2.5.27
0.001018 main (2): libgphoto2 has been compiled with the following options:
0.001088 main (2): + standard camlib set SKIPPING SOME (ax203 canon digigr8 dimagev directory docupen jl2005a jl2005c kodak_dc240 mars pentax ptp2 ricoh_g3 sierra sonix sq905 st2205 topfield tp6801 SKIPPING lumix)
0.001173 main (2): + gcc (C compiler used)
0.001242 main (2): + ltdl (for portable loading of camlibs)
0.001311 main (2): + EXIF (for special handling of EXIF files)
0.001399 main (2): libgphoto2_port 0.12.0
0.001473 main (2): libgphoto2_port has been compiled with the following options:
0.001541 main (2): + iolibs: disk ptpip serial usb1 usbdiskdirect usbscsi
0.001610 main (2): + gcc (C compiler used)
0.001678 main (2): + ltdl (for portable loading of iolibs)
0.001746 main (2): + EXIF (for vusb)
0.001813 main (2): + USB (libusb1, for USB cameras)
0.001880 main (2): + serial (for serial cameras)
0.001947 main (2): + no resmgr (serial port access and locking)
0.002015 main (2): + no ttylock (serial port locking)
0.002083 main (2): + lockdev (serial port locking)
0.002152 main (2): CAMLIBS env var not set, using compile-time default instead
0.002219 main (2): IOLIBS env var not set, using compile-time default instead
0.002288 main (2): invoked with following arguments:
0.002355 main (2): --debug
0.002425 main (2): --debug-logfile=gphoto2_debug.log
0.002542 load_settings (2): Creating gphoto config directory (‘/home/Pepa/.gphoto’)
0.002662 load_settings (2): Loading settings from file ‘/home/Pepa/.gphoto/settings’.
0.003067 gp_camera_free (2): Freeing camera…
0.003093 gp_port_free (2): Freeing port…
0.003114 gp_filesystem_reset (2): resetting filesystem
0.003130 gp_filesystem_lru_clear (2): Clearing fscache LRU list…
0.003145 gp_filesystem_lru_clear (2): fscache LRU list already empty
0.003161 delete_all_folders (2): Internally deleting all folders from ‘/’…
0.003177 lookup_folder (2): Lookup folder ‘/’…
0.003193 lookup_folder (2): Found! / is 0x55ec9fc4d6b0
0.003209 recurse_delete_folder (2): Recurse delete folder 0x55ec9fc4d6b0//
0.003224 delete_all_files (2): Delete all files in folder 0x55ec9fc4d6b0//

###################################################################

Pepa@linux-acer:~> neofetch
-++: Pepa@linux-acer
./oooooo/- ---------------
:oooooooooooo:. OS: openSUSE Leap 15.4 x86_64 -+oooooooooooooooo+- Host: Aspire 1810TZ v0.3115
./oooooooooooooooooooooo/- Kernel: 5.14.21-150400.24.41-default
:oooooooooooooooooooooooooo: Uptime: 3 hours, 13 mins
-+oooooooooooooooooooo/- Packages: 2878 (rpm):oo/- .:ooooooooooooooo+: -+oo/. Shell: bash 4.4.23
/oooooo:. -/oooooooooo/. ./oooooo/. Resolution: 1366x768 :+ooooo± :+oooo± :oooooo+: DE: Plasma 5.24.4
.:oooooo/. .:: -+oooooo/. WM: KWin -/oooooo:. ./oooooo+- Theme: Breeze [Plasma], Adwaita [GTK2/3]:+ooooo±:+oooooo: Icons: Adwaita [Plasma], Adwaita [GTK2/3] ./oooooooooo/. Terminal: konsole -/oooo+: CPU: Genuine Intel U4100 (2) @ 1.300GHz
`:/. GPU: Intel Mobile 4 Series Chipset
Memory: 2623MiB / 3820MiB

On a desktop PC, Darktable behaves the same way.
I’m sorry, I don’t know English and I’m using google to translate it.
Thank you for your work on this great program.
Thanks, Pepa