I have had Plex hardware transcoding working for a long time and this AM I installed a GPU to pass through to a VM. I have lost hardware transcoding on Plex. I understand that I need to update the Plex preferences XML file. Problem is I have no idea what to put in there, as I have found the following on the Plex forums. "

User plex is added to the group of the first card found

To manually override the device used, specify HardwareDevicePath="/dev/xxxxxxxxx" in Preferences.xml (while Plex is stopped)

udev should be adding both devices to the same group (render)"

I am unsure what to replace the XXXX with or where to find out.

 

Thanks for any help you can provide.

I would not advise manly editing the preference xml. remove it out right... you should see it in the plex dropdown list...

There are known issues with plex and transcoding that plex is aware of and is working on a fix.

In terms of passing the graphics device, as this is a intel g card (igpu). Plex should see it without this extra parm....
You could try adding:

--device=/dev/dri:/dev/dri

(as NVIDIA and Intel use the same device directories...)

 

otherwise, you may need the additional driver plugin to use the igpu...

example:

*1 not both!

then using plex to make and edit that setting to select the intel igpu for transcode:

Current recommend transcode setting that I'm using with Linux Server Docker and plex settings:

 

 

Had to flip some settings to fix usb tuner card and use recenlty as theses things were working before teh start of teh year.

if you just installed a gpu, make sure bios is not disabling the igpu and defaulting to the new GPU.

 

on amd platforms example, there are some bios options to support muti montior...

As addon G-Cards cards will automatically flag and disable the igpu unless you tell it to otherwise...

Example:

It appears that on Sandy Bridge systems with an H67 (and probably Z68, when they launch) chipsets, it's possible to run both the onboard GPU and an add-on graphics card at the same time. Other 6-series (and later) chipsets may work as long as both the CPU & MB Chipset support Intel's Flexible Display Interface, a DisplayPort-based standard that gives the integrated GPU a direct connection to the onboard video connectors.https://en.wikipedia.org/wiki/Flexible_Display_Interface

Your intel chipset and board manufacture should have info on this. Not Enoch info to assisting remotely...