amdgpu multi monitor - clock, heat and power problem

[Rigo Reddig <rigo.reddig-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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I have 2 Gigabyte RX580's in my desktop workstation. 
I'm running Arch Linux with KDE Plasma on the 5.0.6 kernel.

The cards themselves work fine, except,
I have two 1080p HDMI monitors plugged into one of these cards.
One in a native HDMI port, one in a passive DVI->HDMI adapter.

This causes the following problem for idle usage:

 1. Memory clock is effectively locked at 200Mhz always
 2. Core clock is constantly at high frequency P-state
 3. Temperatures are increased
 4. Power consumption is increased (significantly)
 5. PCI bus is always at full speed
 6. Forcing core clock to 300Mhz, uses a higher than usual voltage

Below is an excerpt from the rocm-smi utility for the automatic defaults 
(I have omitted overclock and powercap values for formatting purposes)


2 Monitors connected to GPU 0, No monitors connected to GPU 1
ROCm System Management Interface        
==========================================================================
=====
GPU   Temp   AvgPwr   SCLK    MCLK    PCLK           Fan     Perf    GPU%
0     44.0c  36.193W  1145Mhz 2000Mhz 8.0GT/s, x16   40.0%   auto    0%       
1     37.0c  28.104W  300Mhz  300Mhz  2.5GT/s, x8    0.0%    auto    0%       
==========================================================================
=====
End of ROCm SMI Log              

GPU 0 is idle and yet running SCLK and MCLK at unnecessary power levels
GPU 1 is truly idle
Regarding GPU 0 temperature, I have actually setup a daemon to run the fan at a 
consistent rate to prevent it from constantly peaking.

-------------------------------------------------------------------------------

1 Monitors connected to GPU 0, No monitors connected to GPU 1
ROCm System Management Interface        
==========================================================================
=====
GPU   Temp   AvgPwr   SCLK    MCLK    PCLK           Fan     Perf    GPU%
0     36.0c  28.103W  300Mhz  300Mhz  2.5GT/s, x8    0.0%    auto    0%       
1     37.0c  28.104W  300Mhz  300Mhz  2.5GT/s, x8    0.0%    auto    0%       
==========================================================================
=====

2 Monitors connected to GPU 0, No monitors connected to GPU 1

2 Monitors connected to GPU 0, No monitors connected to GPU 1
ROCm System Management Interface        
==========================================================================
=====
GPU   Temp   AvgPwr   SCLK    MCLK    PCLK           Fan     Perf    GPU%
0     44.0c  31.086W  300Mhz 2000Mhz  2.5GT/s, x8   40.0%    low    0%       
1     37.0c  28.104W  300Mhz  300Mhz  2.5GT/s, x8    0.0%    low    0%       
==========================================================================
=====

Peculiarly even with low power state forced, the GPU runs at a voltage (950mV) in excess 
of what is required for 300Mhz (750mV)


==========================================================================
=====
cat /sys/kernel/debug/dri/0/amdgpu_pm_info                                                                                                                                                                                         
jupiter: Mon Apr  8 21:57:29 2019

Clock Gating Flags Mask: 0x3fbcf
        Graphics Medium Grain Clock Gating: On
        Graphics Medium Grain memory Light Sleep: On
        Graphics Coarse Grain Clock Gating: On
        Graphics Coarse Grain memory Light Sleep: On
        Graphics Coarse Grain Tree Shader Clock Gating: Off
        Graphics Coarse Grain Tree Shader Light Sleep: Off
        Graphics Command Processor Light Sleep: On
        Graphics Run List Controller Light Sleep: On
        Graphics 3D Coarse Grain Clock Gating: Off
        Graphics 3D Coarse Grain memory Light Sleep: Off
        Memory Controller Light Sleep: On
        Memory Controller Medium Grain Clock Gating: On
        System Direct Memory Access Light Sleep: Off
        System Direct Memory Access Medium Grain Clock Gating: On
        Bus Interface Medium Grain Clock Gating: Off
        Bus Interface Light Sleep: On
        Unified Video Decoder Medium Grain Clock Gating: On
        Video Compression Engine Medium Grain Clock Gating: On
        Host Data Path Light Sleep: On
        Host Data Path Medium Grain Clock Gating: On
        Digital Right Management Medium Grain Clock Gating: Off
        Digital Right Management Light Sleep: Off
        Rom Medium Grain Clock Gating: On
        Data Fabric Medium Grain Clock Gating: Off

GFX Clocks and Power:
        2000 MHz (MCLK)
        300 MHz (SCLK)
        600 MHz (PSTATE_SCLK)
        1000 MHz (PSTATE_MCLK)
        950 mV (VDDGFX)
        31.14 W (average GPU)

GPU Temperature: 43 C
GPU Load: 0 %

UVD: Disabled

VCE: Disabled
==========================================================================
=====

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