i don't use the spawn profile anymore.
I use the docker image from linuxserver/tvheadend. I exported the settings of the container and added the following in the linuxserver-tvheadend.json, and recreated the container by importing the settings:
"devices" : [
{
"CgroupPermissions" : "rwm",
"PathInContainer" : "/dev/dri",
"PathOnHost" : "/dev/dri"
},
{
"CgroupPermissions" : "rwm",
"PathInContainer" : "/dev/dvb",
"PathOnHost" : "/dev/dvb"
}
],