topic Re: Cannot access /sys/class/video4linux in Items with no label

Cannot access /sys/class/video4linux

SKuma51 — Wed, 31 Oct 2018 12:16:04 GMT

I'm installing D415 on ubuntu 16.04

On following the instruction manual https://github.com/IntelRealSense/librealsense/blob/master/doc/distribution_linux.md

, i ended up with an error on running realsense-viewer

"realsense-viewer

31/10 12:04:45,653 ERROR [140307828632128] (backend-v4l2.cpp:518) Cannot access /sys/class/video4linux"

My Kernel version is 4.15.0-36-generic

I googled and tried various solution but still no success. Please help!!

Re: Cannot access /sys/class/video4linux

MartyG — Wed, 31 Oct 2018 12:26:43 GMT

In a previous case last month of this error at the same line (backend-v412.cpp line 518), the user corrected the problem by doing a completely fresh install. They believed the cause may have been that they had their kernel versions mixed up.

https://github.com/IntelRealSense/librealsense/issues/2427# issue-362556361 realsense-viewer: Cannot access /sys/class/video4linux · Issue # 2427 · IntelRealSense/librealsense · GitHub

Re: Cannot access /sys/class/video4linux

SKuma51 — Wed, 31 Oct 2018 12:43:15 GMT

Installing fresh Ubuntu would take a lot of time since i have ROS packages and many other things installed.

Re: Cannot access /sys/class/video4linux

MartyG — Wed, 31 Oct 2018 12:54:46 GMT

The official Ubuntu documentation has advice about removing old kernels. In practice though it may be too risky on your installation, as pulling out a kernel one or more of your programs depends on could create all sorts of problems.

https://help.ubuntu.com/community/RemoveOldKernels https://help.ubuntu.com/community/RemoveOldKernels

I wonder if an alternative would be to create a separate Ubuntu installation on a USB stick (a 'boot stick') just for Librealsense, so that you don't break your existing installation.

https://tutorials.ubuntu.com/tutorial/tutorial-create-a-usb-stick-on-ubuntu# 0 Create a bootable USB stick on Ubuntu | Ubuntu tutorials

Re: Cannot access /sys/class/video4linux

SKuma51 — Wed, 31 Oct 2018 15:48:23 GMT

I solved the issue.

DO everything and just install sudo apt-get install realsense-uvcvideo

Re: Cannot access /sys/class/video4linux

MartyG — Wed, 31 Oct 2018 15:51:49 GMT

Great news! I'm really pleased you found a solution. Thanks for letting us know!

Re: Cannot access /sys/class/video4linux

SKuma51 — Mon, 05 Nov 2018 10:35:56 GMT

It was working fine till yesterday and now it doesn't even detect the camera. I'm getting the same old error "Cannot access /sys/class/video4linux"

Could you please help me resolve this issue.

Re: Cannot access /sys/class/video4linux

idata — Mon, 05 Nov 2018 20:54:32 GMT

Hello shrijan00,

Could you please let us know the output of: lsusb ?

Also, could you please update the firmware to the latest release? Link to the instructions http:// https://www.intel.com/content/www/us/en/support/articles/000028171/emerging-technologies/intel-realsense-technology.html here and you can download the firmware from https://downloadcenter.intel.com/download/28237/Latest-Firmware-for-Intel-RealSense-D400-Product-Family here.

Looking forward to your reply!

Best regards,

Eliza

Re: Cannot access /sys/class/video4linux

SKuma51 — Mon, 05 Nov 2018 21:39:31 GMT

Hi,

So i uninstalled and did once again, so it is working for now.

But when using the roslaunch i'm still getting this error but using rqt_image_view iḿ still able to see image but i think this error is either due to kernel issue or sdk.

Re: Cannot access /sys/class/video4linux

SKuma51 — Tue, 06 Nov 2018 07:29:25 GMT

And when i run realsense-viewer, it works but in the terminal it keeps telling "UVC metadata payloads not available. Please refer to installation chapter for details."

My Kernel version is 4.15.0-36-generic

Re: Cannot access /sys/class/video4linux

idata — Tue, 06 Nov 2018 12:00:43 GMT

Hello shrijan00,

On this https://github.com/intel-ros/realsense/issues/503 thread a solution for this error message is to install librealsense2-dkms with sudo apt-get install librealsense2-dkms=1.3.1-0ubuntu3

I noticed that you have posted this issue on another thread too - https://intel-openport-v8.hosted.jivesoftware.com/thread/130792.

Would you agree to continue the conversation there to avoid redundancy?

Thank you,

Eliza

Re: Cannot access /sys/class/video4linux

SKuma51 — Tue, 06 Nov 2018 23:48:37 GMT

Running that command, it doesn't even detect now. I removed it so at least it is working somehow withe warning

[ WARN] [1541544389.804503667]: Frame metadata isn't available! (frame_timestamp_domain = RS2_TIMESTAMP_DOMAIN_SYSTEM_TIME)