Because its not solely a mining computer. Its a Ubuntu server doing a range of tasks.
All attempts to modify clocks and voltages directly as per https://www.reddit.com/r/overclocking/comments/agwtts/how_to_overclock_your_amd_gpu_on_linux/
have failed. pp_od_clk_voltage file will not change to new values.

For those running Ubuntu 18.04 & AMD Cards.

How are you modifying the core & mem clocks and voltages of AMD cards?
In Windows AMD Mem Tweak allows these to be changed in the GUI but I can't find a way to do it in Ubuntu in AMD Mem Tweak or any other way.
I've got thirsty Vega 56s that desperately need to be downvolted (otherwise my wife will kill me on the electricity bills!).

Please help!

LIKELY CRIMINAL CARTEL CONDUCT BY FACEBOOK & GOOGLE

This conduct is likely a breach of the s45AD Anti-Cartel provisions of the Australian Competition and Consumer Act. 
I highlight relevant sections of the law below.

It is a contract, arrangement or understanding between Google (and its aggregators and affiliates) and Facebook which:
a) (Purpose Condition) has the purpose of directly preventing the supply of services (internet advertising) to a class of persons (cryptocurrency service suppliers & ICOs) by all parties to the contract arrangement or understanding and
b) (Competition Condition) where the parties (Facebook and Google) are in competition with each other in relation to the supply of internet advertising services.

This is potentially serious criminal conduct and subject to pecuniary penalties of up to 10% of FaceBook and Google's revenue.

Who wants to help me (an experienced Australian lawyer) bringing legal action?

I have three of these MSI Z170A GAMING PRO CARBON boards that have died because of some of the silly LEDs on the bottom of the board being knocked off.

Any suggestions how to fix?

Why did MSI build a board with a trivial minor feature that if damaged brick's the board?

Its a well established fact in the high tech startup sector that only a small percentage of funded startups succeed. In the VC world they hope for 10% of the very carefully vetted projects they fund to succeed.

ICOs will be no different, but the ones that do succeed will change the world - and that's what the incumbent monopolists are scared of.

This is exactly what some ICOs are trying to do!
Which is exactly why its anti-competitive for Facebook to block fundraising by a competitor.

Facebook and Google blocking all ICO ads is anti-competitive behaviour by monopolists masquerading as consumer protection!
Same story as with the banks.
They know that ICOs are raising billions for decentralised services that will replace them.

Just look at how Telegram's multi-billion ICO threatens Facebook's WhatApp.
There is a decentralised App out there to replace every existing web based service that is so dominant today.

There is an opportunity to seek legal injunctions against Facebook and Google to prevent this illegal misuse of market power.

Who is interested?

Australia is a very good jurisdiction for legitimate ICOs.
The definition of securities is very narrow and does not catch most tokens.

Legitimate utility tokens (which exchange ETH for a token providing some service or utility) will likely fall under the barter exception.

The law is clear and the regulator has much less discretion than in the US.
ICOs just need to follow general laws about truthful advertising.

It is an advanced first world English speaking economy with a wealthy population and is generally crypto friendly (they changed the law to exempt cryptos from GST/VAT).

Contact me for more details (I am Australian lawyer).

This is a common problem when a card it pushed too hard (overclocked, dcri too high etc). Reduce settings until card is stable.

Anyone had trouble with the AMD Wattman compute workloads switch using 17.12.2 minimal setup drivers?

I just added two Rx570s to three Rx580s already running in a rig.
Now one of the RX580s won't switch from graphics to compute workload - it appears to work but when Wattman restarts it still shows graphics and this card is slow in Claymore Dual Miner 10.2.
All the other cards are fine and this card switched properly to compute before adding the extra two cards.

Any ideas? This is a strange one.

I was looking to upgrade my other rigs from the Blockchain beta drivers but now I'm not sure I should.

This may be a stupid question but do you need more than 4Gb of RAM on your rig for the "Above 4Gb decoding" to work?

I've also been unable to get more than 2xPro Duos working properly in Windows 10.

Problem seems to be be in BIOS which can't allocate enough resources with "Above 4Gb decoding" disabled.
Enabling this option seems to cause all sorts of problems with the Pro Duos, including making BIOS inaccessible thereafter (requiring CMOS reset).

Without it, best I have managed is 5x Fiji with 3 Pro-Duos' installed (wasting half a card) or 4 x Fiji + a RX470 (which can't use same drivers so no=go)
I once got 6 cards recognised briefly by disabling the USB ports but then couldn't use a keyboard/mouse. :-)

I've tried with both X99 and H270 mobos. Hoping for better luck with Z170 Gaming Pro Carbon but I hear that Fijis are a problem there too.

I'm using the Claymore v12.4 options -mclock, mvddc & cvddc options to overclock and undervolt 2 x RX470s.

These changes are only taking effect on the first card but not the second which according to GPU-Z is behaving as stock.

I've tried multiple syntax (eg "-mclock 1255", "-mclock 1255,1255", "-mclock 1255, 1255" & even "-mclock 1255,1255,155".

Nothing seems to make the changes take effect on the 2nd card, although overall performance is slightly better with each card specified separately.

Any ideas?

The suspense is killing me!

Thanks kilo17.

When you say Pro Duos are best in linux do you use the FirePro workstation drivers (Ver 15.302.2001) or the AMDGPU (Ver 16.60) drivers?

I'm looking at 2400 watt of Platinum 12v PSU for the 4 x Pro Duo cards and ~500 watt ATX supply for the motherboard.

What miner are you using to get 980-1050 sol/s on ZEC?

Can you explain further re card placement on mobo.
I'm planning to use a MSI X99A SLI PLUS Motherboard with all 4 cards in the 4 PCIe 3.0 x16 slots. 3 will be mounted directly and the 4th via a PCIe x 16 riser ribbon.

I'm glad to hear that this can all be made to work and that you're getting excellent ZEC sol/s.

Hi Crytominer,
Well its definitely not a motherboard issue -that's some serious motherboard testing  

I was just re-reading your Claymore extract above.
It IS seeing all 6 GPUs in the temperature & fan % readings, just not in the Hashing reading.
So maybe it is a Claymore issue - you should try raising it with him.
In any case with the Pro Duos now available for $800 they are a good Zcash mining option which more people will be using and Claymore should support.

I also suggest you try the official AMD linux drivers for Pro Duo (FirePro which I linked in my first post).

Did you have all 6 GPUs working on Nicehash benchmark using Eth sgminer? (should be doing better than 28 though - would expect 31+ 62 total) See https://forum.ethereum.org/discussion/6707/radeon-pro-duos

If not you could have a bad GPU?

Hi cracker666,
I've been following your problem with the 3 x Pro Duo with interest as I have 4 x Pro Duo's on the way!
I was hoping to put them in a single rig!

I have a few questions / suggestions:

1) Are you still using the same Z170A XPOWER GAMING TITANIUM EDITION motherboard?

2) Are you using the latest version of EthOS (1.2.0 released 3 days ago)?
I note that this includes an update to latest consumer card AMDGPU 16.60 linux drivers which don't appear to support Pro Duo.
AMD site shows only workstation linux drivers as supporting Pro Duo http://support.amd.com/en-us/download/workstation/previous/detail?os=Linux+x86_64&rev=15.302.2001

3) Have you tried the latest version of Pro Duo Windows Drivers (17.3.2 released 4 days ago)

Good luck!
I'm hoping there is a solution.