https://bugs.freedesktop.org/show_bug.cgi?id=111482

--- Comment #1 from Robert <freedesktop@postfach.xyz> ---
Not sure if it's of any use but I figured out today that after starting KDE
Plasma, launching "Konsole" and typing "sensors" the output is basically
garbage:

"""
amdgpu-pci-0c00
Adapter: PCI adapter
vddgfx:       +0.72 V  
fan1:             N/A  (min =    0 RPM, max = 3200 RPM)
edge:             N/A  (crit = +118.0°C, hyst = -273.1°C)
                       (emerg = +99.0°C)
junction:         N/A  (crit = +99.0°C, hyst = -273.1°C)
                       (emerg = +99.0°C)
mem:              N/A  (crit = +99.0°C, hyst = -273.1°C)
                       (emerg = +99.0°C)
power1:           N/A  (cap = 180.00 W)

asus-isa-0000
Adapter: ISA adapter
cpu_fan:        0 RPM
"""

I can repeat this a few times and it stays the same. And I always see this
errors in "dmesg" or "journalctl":

"""
[  137.931148] amdgpu: [powerplay] failed send message: TransferTableSmu2Dram
(18)      param: 0x00000006 response 0xffffffc2
[  137.931150] amdgpu: [powerplay] Failed to export SMU metrics table!
[  140.144885] amdgpu: [powerplay] failed send message: SetDriverDramAddrHigh
(14)      param: 0x00000080 response 0xffffffc2
[  142.358346] amdgpu: [powerplay] failed send message: SetDriverDramAddrHigh
(14)      param: 0x00000080 response 0xffffffc2
[  142.358348] amdgpu: [powerplay] Failed to export SMU metrics table!
[  144.571878] amdgpu: [powerplay] failed send message: SetDriverDramAddrHigh
(14)      param: 0x00000080 response 0xffffffc2
[  146.785069] amdgpu: [powerplay] failed send message: SetDriverDramAddrHigh
(14)      param: 0x00000080 response 0xffffffc2
[  146.785071] amdgpu: [powerplay] Failed to export SMU metrics table!
[  148.998450] amdgpu: [powerplay] failed send message: SetDriverDramAddrHigh
(14)      param: 0x00000080 response 0xffffffc2
[  151.211737] amdgpu: [powerplay] failed send message: SetDriverDramAddrHigh
(14)      param: 0x00000080 response 0xffffffc2
[  151.211738] amdgpu: [powerplay] Failed to export SMU metrics table!
[  153.425132] amdgpu: [powerplay] failed send message: SetDriverDramAddrHigh
(14)      param: 0x00000080 response 0xffffffc2
[  155.638843] amdgpu: [powerplay] failed send message: SetDriverDramAddrHigh
(14)      param: 0x00000080 response 0xffffffc2
[  155.638845] amdgpu: [powerplay] Failed to export SMU metrics table!
"""

It looks like that for every value "sensors" try to get it prints one such
"failed send message..." errors.

Now the funny thing is if I start "Firefox" the screen "flickers" very shortly
and afterwards "sensors" prints useful values e.g.:

"""
amdgpu-pci-0c00
Adapter: PCI adapter
vddgfx:       +0.72 V  
fan1:         531 RPM  (min =    0 RPM, max = 3200 RPM)
edge:         +54.0°C  (crit = +118.0°C, hyst = -273.1°C)
                       (emerg = +99.0°C)
junction:     +56.0°C  (crit = +99.0°C, hyst = -273.1°C)
                       (emerg = +99.0°C)
mem:          +66.0°C  (crit = +99.0°C, hyst = -273.1°C)
                       (emerg = +99.0°C)
power1:       34.00 W  (cap = 180.00 W)

asus-isa-0000
Adapter: ISA adapter
cpu_fan:        0 RPM
"""

But the problem with high idle power consumption of course doesn't change.
Today I updated to the latest firmware from 2019-08-26 and also updated Mesa to
19.2-rc1. In the last post I forgot to mention that I'm currently using
"libdrm-git 2.4.99.r16.g14922551-1" which is basically libdrm master branch
AFAIK.

I'm really a little bit out of ideas ATM. Besides the idle power consumption
thingy everything is working perfectly. Even Minecraft ;-)

Before I installed Archlinux from scratch I used a Nvidia GTX 1060 with the
Nvidia binary drivers in the same host as the Sapphire card I now use wasn't
released at that time. With that card I hadn't any issues with idle power
consumption. It was around 8-10W while running KDE Plasma.

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