I found the solution…
I’m Running Proxox with LXC container + vGPU on intel 13500
vGPU configuration provide 7 RenderD128 to 136
the only solution for HW + HDR ToneMapping to work is to use only RenderD128 and Card0
the configuration of my lxc is the following
lxc.cgroup2.devices.allow: c 226:0 rwm
lxc.cgroup2.devices.allow: c 226:128 rwm
lxc.cgroup2.devices.allow: c 29:0 rwm
lxc.mount.entry: /dev/fb0 dev/fb0 none bind,optional,create=file
lxc.mount.entry: /dev/dri/card0 dev/dri/card0 none bind,optional,create=file
lxc.mount.entry: /dev/dri/renderD128 dev/dri/renderD128 none bind,optional,create=file
with other card or RenderD different than 128, HW works, tonemapping not
