rs_error was raised when calling rs2_get_option "failed to set power state"

[garretthilyer]

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Required Info
Camera Model	{ D455 }
Firmware Version	(Open RealSense Viewer -->2.55)
Operating System & Version	Ubuntu 24.04, Arm64
Kernel Version (Linux Only)	6.8.0-1005-raspi
Platform	Raspberry Pi 4
SDK Version	{ legacy / 2.. }
Language	{C}
Segment	{others}

Issue Description

I used this code to build realsense.
My code was working completely fine, I could capture frames for long periods of time.
I started messing around with sensors and trying to adjust exposure, contrast, white balance, etc.

Everytime I would use either:
rs2_get_option(sensor, RS2_OPTION_CONTRAST, &e) or rs2_set_option(sensor, RS2_OPTION_CONTRAST, 50.0, &e)

I would get this error:
rs_error was raised when calling rs2_get_option(options:0xaaaada8ea640, option_id:2): failed to set power state

I tried all the different types of options and the option_id tag would update depending on the parameter I wanted to change. Assume I am setting up the ctx, config, pipeline, device correctly...

This is the code I added for the sensor setting:

// Request the entire list of sensors
    rs2_sensor_list* sensor_list = rs2_query_sensors(dev, &e);
    check_error(e);

    // Request access to the total number of sensors
    int num_sensor = rs2_get_sensors_count(sensor_list, &e);
    check_error(e);

    for (int i = 0; i < num_sensor; i++) {
        // iterate through all sensors
        rs2_sensor* sensor = rs2_create_sensor(sensor_list, i, &e);
        check_error(e);
        // until you find color sensor
        if (rs2_is_sensor_extendable_to(sensor, RS2_EXTENSION_COLOR_SENSOR, &e) && !e) {
            
            // get color params
            printf("exposure default: %f \n", rs2_get_option(sensor, RS2_OPTION_CONTRAST, &e));
            check_error(e);

            // potential set of other params here as well ....

        }
        // free sensor
        rs2_delete_sensor(sensor);
    }
    // free sensor list
    rs2_delete_sensor_list(sensor_list);

I tried increasing the USB power output, sleeping for a couple of seconds before I reach this code, and even capturing a couple of data frames before running this. None of that has worked.

I am open to all possible solutions. Thanks in advanced!

[garretthilyer]

Solution!

I was trying to manipulate the sensors after I created the pipeline/enable_stream(). I moved the sensor setting code to directly below the device initialization and it worked completely fine.

[MartyG-RealSense]

Hi @garretthilyer It's excellent to hear that you achieved a solution. Thanks very much for the update!