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Linux Xid 79 'GPU has fallen off the bus' error: how to find the cause

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The NVIDIA driver writes Xid 79 to the Linux kernel log when it cannot reach the GPU over its PCI Express connection. NVIDIA lists failures on the PCIe link as a frequent cause, though failing GPU hardware or other driver issues can also trigger it. The article explains how to pull the relevant Xid and PCIe Bus Error lines from the previous boot using journalctl, and how to check whether a PCIe error preceded the failure. It describes testing with runtime D3 power management and ASPM disabled, using a modprobe option and a kernel parameter respectively. NVIDIA's recommended immediate step is a reboot, and if the error persists, contacting the support organization for the GPU or system.

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