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FS#69267 - Latest linux brings high power consumption in high refresh rates on navi graphics

Attached to Project: Arch Linux
Opened by Paulo Marcos (Myghi63) - Sunday, 10 January 2021, 02:17 GMT
Task Type Bug Report
Category Packages: Core
Status Unconfirmed
Assigned To No-one
Architecture x86_64
Severity High
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 0%
Votes 0
Private No


The latest linux kernel on my system makes my AMD Radeon RX 5500XT 8GB (gigabyte) draw 5 times more power on my 75Hz 1080p monitor (LG 24MK430) via HDMI while idling. On 60Hz, it draws about 3 Watt, while on 75Hz draws about 15 Watt. I also installed the latest linux-lts 5.4.87-1 package to test and it works really well, drawing about 3 Watt on 75Hz, but because of how this kernel version works, my system takes way more time to boot if compared to 5.10.5 kernel. Also I installed Gnome and KDE Plasma desktop environments and, while idling, I got the same results (I'm using xfce4 for reference, with xfwm4).

Additional info:
* package version(s)
Linux version 5.10.5.arch1-1 (linux-zen 5.10.5.arch1-1 also does the same)
* config and/or log files etc.
* link to upstream bug report, if any

Steps to reproduce:
Install arch linux with the latest kernel on a system with high refresh rate monitor and AMD NAVI GPU. The graphics card will heat doing nothing.
This task depends upon

Comment by Paulo Marcos (Myghi63) - Friday, 15 January 2021, 13:44 GMT
I tried all 5.10.X kernels and every single one makes my gpu heat doing nothing with an refresh rate above 60Hz.