Radeon RX560D @full GPU clock speed.. how to enable power savings mode

graysky · 2022-04-10 16:54:46

I am using the kernel amdgpu module to drive a Yeston RX560D. In querying /sys/kernel/debug/dri/0/amdgpu_pm_info I see that the core GPU frequency is always at full throttle, example while idle:

# head /sys/kernel/debug/dri/0/amdgpu_pm_info 
GFX Clocks and Power:
	1500 MHz (MCLK)
	1149 MHz (SCLK)
	387 MHz (PSTATE_SCLK)
	625 MHz (PSTATE_MCLK)
	1012 mV (VDDGFX)
	27.97 W (average GPU)

GPU Temperature: 49 C
GPU Load: 0 %

In reading through the AMDGPU wiki article, it seems one can change the profile first by enabling manual mode then by selecting one of the profiles. I tried this selecting the "power_savings" profile but found that the GPU freq did not change. What am I missing?

# echo manual > /sys/class/drm/card0/device/power_dpm_force_performance_level
# echo 2 > /sys/class/drm/card0/device/pp_power_profile_mode
# head /sys/kernel/debug/dri/0/amdgpu_pm_info
GFX Clocks and Power:
	1500 MHz (MCLK)
	1149 MHz (SCLK)
	387 MHz (PSTATE_SCLK)
	625 MHz (PSTATE_MCLK)
	1012 mV (VDDGFX)
	12.94 W (average GPU)

GPU Temperature: 49 C
GPU Load: 0 %

Lone_Wolf · 2022-04-12 10:01:00

The used power did go down from 27.97 W to 12.94 W so it appears changing the power profile had some effect.

I do think those values are very high though, this is what I get on a RX 580 with default profiles.

# head /sys/kernel/debug/dri/0/amdgpu_pm_info
GFX Clocks and Power:
        300 MHz (MCLK)
        300 MHz (SCLK)
        600 MHz (PSTATE_SCLK)
        1000 MHz (PSTATE_MCLK)
        750 mV (VDDGFX)
        4.222 W (average GPU)

GPU Temperature: 38 C
GPU Load: 0 %
#

Active State Power Management (aspm) might be involved.

AMD enabled aspm by default for polaris cards in kernel 5.13, but whether it works well depends on motherboard & firmware.
Recently problems have been reported with intel alder lake and certain amd video cards.
Also on my own system mobo + firmware don't support aspm properly and enabling aspm increases used video power instead of lowering it.

Try adding pcie_aspm=off to your bootloader command line.
(incase you already have it disabled, try enabling it.)

graysky · 2022-04-12 16:53:34

I booted with that parameter and now see the following, this is without me changing default modes, just booting and querying the command:

# head /sys/kernel/debug/dri/0/amdgpu_pm_info
GFX Clocks and Power:
	1500 MHz (MCLK)
	885 MHz (SCLK)
	387 MHz (PSTATE_SCLK)
	625 MHz (PSTATE_MCLK)
	850 mV (VDDGFX)
	15.0 W (average GPU)

GPU Temperature: 47 C
GPU Load: 0 %

@Lone_Wolf - can you provide a link to the recent problems re: adler lake stuff you mentioned? Thanks!

Last edited by graysky (2022-04-13 10:59:33)

Lone_Wolf · 2022-04-13 14:31:19

Sure, I saw it on phoronix

Following the kernel ML thread about the patch lead to https://gitlab.freedesktop.org/drm/amd/-/issues/1885

graysky · 2022-04-13 17:27:47

Thanks, oddly enough the patch they called out seems to be applied to 5.17.2.

Arch Linux

#1 2022-04-10 16:54:46

Radeon RX560D @full GPU clock speed.. how to enable power savings mode

#2 2022-04-12 10:01:00

Re: Radeon RX560D @full GPU clock speed.. how to enable power savings mode

#3 2022-04-12 16:53:34

Re: Radeon RX560D @full GPU clock speed.. how to enable power savings mode

#4 2022-04-13 14:31:19

Re: Radeon RX560D @full GPU clock speed.. how to enable power savings mode

#5 2022-04-13 17:27:47

Re: Radeon RX560D @full GPU clock speed.. how to enable power savings mode

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