realsense-viewer setting option give error

[tarekmuallim]

---

Required Info
Camera Model	D400
Firmware Version	05.12.06.00
Operating System & Version	Linux (Ubuntu 18)
Kernel Version (Linux Only)	5.3.0-28-generic
Platform	PC
SDK Version	2.36
Language	c++

Issue Description

I have installed the packages using apt-get
the installation was fine
no error.

when I open the realsense-viewer I get this errors:

27/07 16:34:35,448 ERROR [140020130440960] (types.h:308) xioctl(VIDIOC_S_CTRL) failed Last Error: Invalid argument
27/07 16:34:35,448 WARNING [140020130440960] (sensor.cpp:632) Exception was thrown when inspecting Raw RGB Camera property Controls exposure time of color camera. Setting any value will disable auto exposure
27/07 16:34:35,479 ERROR [140020130440960] (types.h:308) xioctl(VIDIOC_S_CTRL) failed Last Error: Invalid argument
27/07 16:34:35,479 WARNING [140020130440960] (sensor.cpp:632) Exception was thrown when inspecting Raw RGB Camera property Controls white balance of color image. Setting any value will disable auto white balance

and if I try to change any parameter value for example "Laser Power" I get an error:

Backend in rs2_set_option(options:0x7f58dc015ea0, option:Laser Power, value:300):
set_xu(...). xioctl(UVCIOC_CTRL_QUERY) failed Last Error: Device or resource busy

what is the problem and how to solve it.

[MartyG-RealSense]

Hi @tarekmuallim There was a similar past case in the link below.

#5166

It is a very long discussion, so a good starting point may be the link below, which jumps to a point in the discussion that provides a list of instructions to try that will hopefully correct your problem.

#5166 (comment)

[tarekmuallim]

Hi @MartyG-RealSense

I tried this:

sudo apt-get purge librealsense2-dkms
sudo apt-get purge librealsense2-dbg
sudo apt-get purge librealsense2-dev
sudo apt-get purge librealsense2-utils

sudo apt-get update --fix-missing && sudo apt-get install -f && sudo apt-get dist-upgrade -y

sudo apt-get install --reinstall linux-modules-extra-$(uname -r)

then I run this patch with no error
./scripts/patch-realsense-ubuntu-lts.sh

sudo apt-get install librealsense2-dkms
sudo apt-get install librealsense2-utils
sudo apt-get install librealsense2-dev
sudo apt-get install librealsense2-dbg

and I still have the same error!

[MartyG-RealSense]

I would expect to see VIDIOC errors as a result of a problem related to the Linux kernel. There are a couple more cases in the links below that are similar to yours:

#3426
#5815

I believe that patching a DKMS package installation with ./scripts/patch-realsense-ubuntu-lts.sh is not necessary, and instead is a command used doing a manual installation from source.

One RealSense user got their installation working by purging old files and then doing a fresh install from the repositories.

#3426 (comment)
https://github.com/IntelRealSense/librealsense/blob/master/doc/distribution_linux.md

Alternatively, another installation method that you could consider is building librealsense from a source-code folder with a backend RSUSB installation after downloading a source-code zip file from the SDK releases page and extracting the librealsense folder from it.

#6368 (comment)

The Releases page is in the link below, and the "Assets" list containing the download link for the source-code zip file is at the bottom of the information listing for each SDK version.

https://github.com/IntelRealSense/librealsense/releases/

[tarekmuallim]

Thank you for your help @MartyG-RealSense
building from source using -DFORCE_RSUSB_BACKEND=true solve the problem

[MartyG-RealSense]

I'm very pleased to hear that the method worked for you - thanks for the update!