Detecting 1 of 2 GPUs: NVRM: RmInitAdapter failed

Hi,

I have the following build:
i9 9900K, ASUS Z390, 2x 1080Ti

I’m running ubuntu 16.04 with driver 418.56. Only 1 GPU is detected:

$ lspci | grep -i nv
01:00.0 VGA compatible controller: NVIDIA Corporation Device 1b06 (rev a1)
01:00.1 Audio device: NVIDIA Corporation Device 10ef (rev a1)
02:00.0 VGA compatible controller: NVIDIA Corporation Device 1b06 (rev a1)
02:00.1 Audio device: NVIDIA Corporation Device 10ef (rev a1)
$ dmesg | grep NVRM
[    1.469890] NVRM: loading NVIDIA UNIX x86_64 Kernel Module  418.56  Fri Mar 15 12:59:26 CDT 2019
[   19.924743] NVRM: RmInitAdapter failed! (0x31:0xffff:834)
[   19.924904] NVRM: rm_init_adapter failed for device bearing minor number 1

“Above 4G Decoding” in the BIOS is disabled - trying to enable it causes a blank screen after grub.

Any ideas?

Might be a hardware failure, did you already reseat the cards, swap slots and use the failing one as only card?

You’re right. Putting 2 GPUs from a working machine shows them both to be detected. First time we use a 16 PCIe CPU was also the first time we encountered a GPU failure out of the box…

Thanks!