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amdgpu-pro 17.40 on Ubuntu 16.04 problem with pci-e X16 slots

Question asked by ivanukl on Dec 11, 2017


I have  a mining rig based on GA-970a-DS3P motherboard and  5x ASUS Strix R9 380 GPUs all of theme are connected with x1 risers. Rig is working fine on ubuntu 14.04 with fglrx 15.12.

After updates to Ubuntu 16.04 and amdgpu-pro 17.40 I have an issue with 2 GPUs connected to x16 slots via x1 risers. During the booting I have  errors:

- "drm:amdgpu_ib_ring_test failed testing  IB on ring 12 (-110)"

- "drm:amdgpu_device_init  ib ring tests failed (-110)"

2GPU connected with riser to x16 ports have hashrate 2 MHash/s and others 20 MHash/s


If GPUs connected directly to x16 slots hash rate is 20 MHash/s on all cards.

Any ideas what can it be?