Missing this line [ lxc.idmap: u 0 100000 65536 ] for working mapping

[B0F1B0]

I want to passthrough my iGPU /dev/dri/card0 + /dev/dri/renderD128 to LXC.

Inside of LXC i need the group video and render which is in LXC:

getent group video | cut -d : -f3              # ---> 44 on LXC

getent group render | cut -d : -f3             # ---> 106 on LXC 

On my Proxmox host the group video and render is:

getent group video | cut -d : -f3              # ---> 44 on Proxmox

getent group render | cut -d : -f3             # ---> 104 on Proxmox

When i run your python-script with this:
python main.py :44=:44 :106=:104

i get the following mapping syntax:

 # Add to /etc/pve/lxc/<container_id>.conf:
lxc.idmap: g 0 100000 44
lxc.idmap: g 44 44 1
lxc.idmap: g 45 100045 61
lxc.idmap: g 106 104 1
lxc.idmap: g 107 100107 65429

# Add to /etc/subuid:

# Add to /etc/subgid:
root:44:1
root:104:1

But my LXC Container does not start. Only when i add this line lxc.idmap: u 0 100000 65536 above your mapping, my Container will start and i see the group video and render in my LXC:

This is my working mapping for lxc:

lxc.cgroup2.devices.allow: c 226:0 rwm
lxc.cgroup2.devices.allow: c 226:128 rwm
lxc.mount.entry: /dev/dri dev/dri none bind,optional,create=dir
lxc.mount.entry: /dev/dri/renderD128 dev/dri/renderD128 none bind,optional,create=file
lxc.idmap: u 0 100000 65536
lxc.idmap: g 0 100000 44
lxc.idmap: g 44 44 1
lxc.idmap: g 45 100045 61
lxc.idmap: g 106 104 1
lxc.idmap: g 107 100107 65429

this is how it looks like in lxc for /dev/dri:

ls -al /dev/dri/

crw-rw---- 1 nobody video   226,   0 May 30 19:28 card0
crw-rw---- 1 nobody render  226, 128 May 30 19:28 renderD128

can you please give me some advice?