I'm fairly sure the speed downgrades to save power (ASPM).
What does 'lspci -vv -s 01:00.0 | grep LnkCap' say?
** Changed in: linux-restricted-signatures-hwe-6.14 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2125583
Title:
NVIDIA RTX 5080 runs at PCIe Gen1 speed on Ubuntu 24.04 with nvidia-
driver-580-open
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