Hey,
I already opened a BUG report for the open kernel modules driver ( Driver cannot initialize GPU (RTX PRO 4000 Blackwell) behind bridge PLX PEX8747 (Supermicro System) · Issue #1225 · NVIDIA/open-gpu-kernel-modules · GitHub ), but I’m still seeking for help, so that I hoped to find some help here.
It seems that the driver for Blackwell GPUs (RTX Pro 4000) has a problem to address the memory behind a PCIe bridge?
An older RTX 6000 can be initialized and does work.
errors: (more informations in the github issue)
[ 8.606516] NVRM: GPU1 Plx_Pex8747_GetBar0: Device has no BAR0!
[ 9.889042] NVRM: GPU2 Plx_Pex8747_GetBar0: Device has no BAR0!
[ 11.281680] NVRM: GPU at PCI:0000:07:00: GPU-2bead814-a1c4-14fa-56a5-499a8d4c17d4
[ 11.281685] NVRM: Xid (PCI:0000:07:00): 79, GPU has fallen off the bus.
[ 11.281689] NVRM: GPU 0000:07:00.0: GPU has fallen off the bus.
[ 11.281696] NVRM: GPU2 krcRcAndNotifyAllChannels_IMPL: RC all channels for critical error 79.
kernel: Linux hostname 6.18.35-gentoo-r1 #2 SMP PREEMPT_DYNAMIC Wed Jul 1 13:09:43 CEST 2026 x86_64 Intel(R) Xeon(R) CPU E5-2630 v4 @ 2.20GHz GenuineIntel GNU/Linux
driver: 595.84 also tried 595.71.05
Is that a scenario which can be fixed?
Thanks in advance