thanks, i could reproduce it and opened an issue on the upstream git repo: https://github.com/intel-gpu/intel-gpu-i915-backports/issues/190the latest commit (as of this writing) in backport/main does not build with kernel 6.8.12-1-pve for me.
the same it seems to build OK and work fine with kernel 6.8.8-3-pve
intel flex 140 with FW: DG02_2.2356