Ubuntu rx 570 rig unable to detect 6th card, only 5 cards

[miningjob]

Hi all,

Not sure if this is a common problem, currently running 6x rx570 on a gigabyte h110-d3a, 4gb ram, 32gb sad, pau 1350w, ubuntu 16.04, amdgpu-pro 17.40

Not sure exactly what is the issue but no matter what i do i cannot get ubuntu to detect the 6th card, it can only ever detect 5 cards

Swapped risers and cards all around, the moment any of the working 5 cards is removed, the previously undetected 6th card will be detected and work as per normal. It does not matter which card or riser i use.. if it was not detected, removing any of the other cards from the board will make it work after booting up

What could be the issue, power supply having trouble powering 6 cards? Motherboard faulty? Driver issue? Don't think is the riser or GPU issue as i have tested each individually and it can mine without issues..

Thanks!

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[miningjob]

Ok, read this post as well about someone who had a similar problem (with different cards) https://bitcointalk.org/index.php?topic=2672656.0

Apparently for this board there is a sequence of plugging, cmos rests, unplugging and plugging and rebooting again in order to get all 6 cards to be detected, will try that later on when my spare set of risers arrive

Would just like the ask the community, suppose using a different board, I know windows has known problems or difficulties when trying to run multiple GPUs (more then 5-6 etc)

For linux, is plugging 12x AMD cards going to be an issue or should it run just fine without any messy workarounds? I'm currently running a few 12x nvidia GPU ubuntu rigs without any issues.. literally just install driver and cuda, run miner and go.. am new to AMD cards hehehe..