[Bug 110865] Rx480 consumes 20w more power in idle than under Windows

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=110865

--- Comment #22 from Dieter Nützel <Dieter@nuetzel-hh.de> ---
Hello Alex and Martin,

I've tried both on my

Polaris 20, RX580 8 GB Sapphire Technology Limited Nitro+ Radeon RX 580

- v2 patched into amd-staging-drm-next (before inclusion of v3)
- v3 with amd-staging-drm-next
https://cgit.freedesktop.org/~agd5f/linux/commit/?h=amd-staging-drm-next&id=ca82748783d8189a54a85f2ea1c2710182ba6138

Both flicker with green/black (?) horizontally lines over both screens.
Mostly during power level switch. For example during mouse movement/interaction
(wheel) and mouse pointer traverse from konsole/etc. to desktop (KDE5 Plasma
5.xx, here).

UVD load (mplayer etc.) is not enough to fix it.
E.g. radv (vkcube) not.

But other gfx load (vkmark/glmark2, etc.).
When there is lower gfx demand during the above tests (glmark2 -b buffer) the
flicker came up, again.

Martin's observation

[-]
If i do 
"echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level"
the flickering stops.
So the flickering is caused by the automatic powermanagement / reclocking.
[-]

Works here, too (tested with v3).

But I never could go below ~32 W !!!
Tested with both Nitro+ BIOS modes.

The PSTATE_xxxx wouldn't change on my card. They stay @ 600/1000 all the time!?

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

GPU Temperature: 31 C
GPU Load: 0 %
MEM Load: 3 %

Any hints?

And sorry for my bad English this time - my best friend from beginning of
German Gymnasium died after 6 years of fight against cancer. He aged only 52.
Leaving a wife and two little girls...

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