RealSense error calling rs2_set_option(options:0x55665d509b00, option:Gain, value:16): xioctl(VIDIOC_S_CTRL) failed Last Error: Invalid or incomplete multibyte or wide character

[96daja11]

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Required Info
Camera Model	D435i
Firmware Version	05.12.06.00
Operating System & Version	Linux Ubuntu 18.04
Kernel Version (Linux Only)	5.4.0-42-generic
Platform	PC
SDK Version	2.36.0
Language	C++
Segment	Robotics

Hi,

I have a process that works fine when I developed it in Ubuntu 16.04, but now when I have updated to Ubuntu 18.04 I get the following error when trying to run it:

RealSense error calling rs2_set_option(options:0x55665d509b00, option:Gain, value:16):
    xioctl(VIDIOC_S_CTRL) failed Last Error: Invalid or incomplete multibyte or wide character 

I saw someone having a similar issue in #6041 in march, and the answer seemed to be that it was a work in progress. So I wonder if there has been any progress regarding this?

[MartyG-RealSense]

Hi @96daja11 In likelihood it is a kernel related issue if xioctl(VIDIOC_S_CTRL) is involved. As kernel 5.4 is not yet officially supported by librealsense (though can work with it), it may be worth trying the backend method of librealsense installation from source code to see whether it solves your error, as this method is not dependent on Linux versions or kernel versions and does not require patching (though it does require an internet connection).

#6368 (comment)

When building librealsense using kernel patchng, my understanding is that using LTS versions of kernels instead of generic is preferable.

[MartyG-RealSense]

Case closed due to no further comments received.