RPi2 suddenly artefacts when playing via NFS - SMB o.k.

Dr. Seltsam · April 17, 2021 at 11:12 AM

Yesterday I suddenly had a lot of green artefacts when playing any movie. I use NFS since years without problems. The NFS server is my Ubuntu 20.10 Desktop machine.

I switched to another client (Nvidia-based HTPC with Ubuntu 20.04.), also using NFS, and there were no problems with Kodi playback.

Today I tried the latest 10.0 nightly build and have the same experience. Playing via SMB works, playing via NFS only with artefacts. I attach the log.

If it were a network or server problem I would assume that this should also effect other clients. So I have no idea what is going on there.

**Klojum** · April 17, 2021 at 1:18 PM Official Post

Not a complete debug log file... Please provide the full log, via a pastebin service to keep our forum server clean.

The network protocol shouldn't produce artifacts on its own.

Dr. Seltsam · April 17, 2021 at 2:13 PM

Ubuntu Pastebin

I have read several similar reports since February. It seems to be a kernel regression. See also here.

My suspect is that Ubuntu has backported this to my kernel 5.8.0-49-generic which was installed yesterday.

The question is why does the problem not occur when Kodi is running on a Ubuntu machine?

Dr. Seltsam · April 18, 2021 at 5:33 PM

It is the latest Kernel 5.8.0-50-generic which makes the problem. It includes a first Patch from December, which makes things even worse for Kodi. A second Patch from 01.02., which notes the problem with Kodi and fixes it, didn't make it into the 5.8 Ubuntu-Kernel.

I upgraded the Server to Ubuntu 21.04 with Kernel 5.11 and the problem disappeared.