Arch Linux

Gosi

Member

From: Vienna, Austria

Registered: 2010-02-25

Posts: 103

[SOLVED] amdgpu: high power usage when using 75Hz refresh rate

Edit: fixed with kernel 5.10.9

Hi

I have an RX5700 AMD GPU and use it with a 75 Hz Display (1080). My DE is KDE (xorg).

Since linux 5.10 I have higher power usage in idle when using 75Hz mode.

with 75Hz:

amdgpu-pci-0900
Adapter: PCI adapter
vddgfx:      775.00 mV 
fan1:        1282 RPM  (min =    0 RPM, max = 3200 RPM)
edge:         +59.0°C  (crit = +100.0°C, hyst = -273.1°C)
                       (emerg = +105.0°C)
junction:     +60.0°C  (crit = +110.0°C, hyst = -273.1°C)
                       (emerg = +115.0°C)
mem:          +58.0°C  (crit = +105.0°C, hyst = -273.1°C)
                       (emerg = +110.0°C)
power1:       40.00 W  (cap = 165.00 W)

with 60Hz:

amdgpu-pci-0900
Adapter: PCI adapter
vddgfx:      775.00 mV 
fan1:           0 RPM  (min =    0 RPM, max = 3200 RPM)
edge:         +55.0°C  (crit = +100.0°C, hyst = -273.1°C)
                       (emerg = +105.0°C)
junction:     +55.0°C  (crit = +110.0°C, hyst = -273.1°C)
                       (emerg = +115.0°C)
mem:          +54.0°C  (crit = +105.0°C, hyst = -273.1°C)
                       (emerg = +110.0°C)
power1:       16.00 W  (cap = 165.00 W)

To avoid flickering on startup I boot the kernel with video=1920x1080@75 and I created an xorg monitor configuration with a 1080p75 mode.

For testing purposes I removed the xorg configuration, but the problem persists.

I noticed it, because my custom fan script which sets low rpm in idle was not working anymore.

Can anyone with a higher refresh rate monitor (vrr) confirm this?

I will try to rollback to 5.9. to see if it is kernel dependent.

Edit: with kernel 5.9.14 the problem disapears

Last edited by Gosi (2021-01-22 08:08:15)

Ropid

Member

Registered: 2015-03-09

Posts: 1,069

Re: [SOLVED] amdgpu: high power usage when using 75Hz refresh rate

This seems to be your bug:

https://gitlab.freedesktop.org/drm/amd/-/issues/1407