Canon camera controls disabled and showing "busy" when remote-controled

[corpsmoderne]

Describe the bug

With libgphoto2 2.5.30 , after gp_camera_init, the camera wheels and buttons are still usable to adjust the camera parameters (for example, ISO or shutter-speed).

With libgphoto2 2.5.31 (also tested with .33), using a wheel or a button is ignored by the camera and the LCD show "busy" in the bottom left corner.

Name the camera
Canon EOS R6m2 usb:001,031

libgphoto2 and gphoto2 version
libgphoto2 2.5.31+

To Reproduce

This code exemplifies the issue: with 2.5.30 the buttons are still active, with 2.5.31 and up, they're busy.

/*
** Compile with:
** gcc -Wall gphoto_busy.c `pkg-config --cflags --libs libgphoto2`
*/

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <gphoto2/gphoto2.h>

int main(int argc, char **argv) {
	Camera	*camera;
	int	retval;
	GPContext *context = context = gp_context_new();

	const char **version = gp_library_version(0);
	printf("version: %s\n", *version);

	gp_camera_new(&camera);

	printf("Camera init.\n");
	retval = gp_camera_init(camera, context);
	if (retval != GP_OK) {
		printf("  Retval of camera_init: %d\n", retval);
		exit (1);
	}
	
	printf("waiting, press any key to quit.\n");
	getc(stdin);
	
	gp_camera_exit(camera, context);
	return 0;
}

[KL1RL]

Confirm this issue on a R6 mk ii using darktable (5.4.1) and gphoto2 (2.5.32) in tethered capture mode.

[corpsmoderne]

I've tested with a Canon EOS R and there is no busy message with 2.5.33, so it doesn't affect all EOS cameras.

[trilader]

I've had this with some EOS cameras as well. I found it helps to set disablemodedial to 0, which enables the local controls on the camera again.

[corpsmoderne]

Thanks @trilader this seemed to have fixed it for me. I'm not sure if the expected default should be true or false though...