[Unit]
Description=Force Thunderbolt-attached NVIDIA GPU PCIe link to Gen1 (generic; cold-boot + hotplug)
# NOTE: do NOT add After=multi-user.target -- combined with Before=nvidia-persistenced +
# WantedBy=multi-user.target it forms an ordering cycle. When systemd breaks the cycle it may
# delete this very service, so on cold boot nvidia would init the eGPU at Gen4 and hang.
After=bolt.service
Before=nvidia-persistenced.service nvidia-powerd.service

[Service]
Type=oneshot
# No RemainAfterExit: so every udev trigger (hotplug) can run it again;
# the script has flock serialization + idempotent skip.
ExecStart=/usr/local/sbin/fix-egpu-link.sh

[Install]
WantedBy=multi-user.target