LM/PCIe Trouble Shooting

List all GPUs

lspci | grep 'VGA'

List PCIe tree for CPU & chipset

lspci -tv | sed '/+-03\.0/,$d'

-[0000:00]-+-00.0  Advanced Micro Devices, Inc. [AMD] Raphael/Granite Ridge Root Complex
           +-00.2  Advanced Micro Devices, Inc. [AMD] Raphael/Granite Ridge IOMMU
           +-01.0  Advanced Micro Devices, Inc. [AMD] Raphael/Granite Ridge Dummy Host Bridge
           +-01.1-[01-04]----00.0-[02-04]--+-01.0-[03]----00.0  Intel Corporation Battlemage G31 [Intel Graphics]
           |                               \-02.0-[04]----00.0  Intel Corporation Device e2f7
           +-01.2-[05]----00.0  Kingston Technology Company, Inc. KC2000/KC2500 NVMe SSD [SM2262EN]
           +-01.3-[06]--+-00.0  NVIDIA Corporation GA106 [GeForce RTX 3060 Lite Hash Rate]
           |            \-00.1  NVIDIA Corporation GA106 High Definition Audio Controller
           +-02.0  Advanced Micro Devices, Inc. [AMD] Raphael/Granite Ridge Dummy Host Bridge
           +-02.1-[07-0e]----00.0-[08-0e]--+-00.0-[09]--
           |                               +-08.0-[0a]----00.0  Realtek Semiconductor Co., Ltd. RTL8126 5GbE Controller
           |                               +-09.0-[0b]----00.0  Intel Corporation Wi-Fi 6E(802.11ax) AX210/AX1675* 2x2 [Typhoon Peak]
           |                               +-0a.0-[0c]----00.0  Realtek Semiconductor Co., Ltd. RTL8126 5GbE Controller
           |                               +-0c.0-[0d]----00.0  Advanced Micro Devices, Inc. [AMD] 800 Series Chipset USB 3.x XHCI Controller
           |                               \-0d.0-[0e]----00.0  Advanced Micro Devices, Inc. [AMD] 600 Series Chipset SATA Controller

Verify link speed & width

sudo lspci -vvv -s 03:00 | grep 'Lnk'