I use RX550 and when I wake the PC from sleep, the screen becomes flickering.

Brief summary of the problem:

When I wake the PC from sleep, my monitor will keep flickering.

Hardware description:

• CPU: AMD Ryzen 9 3900X 12-Core Processor
• GPU: Sapphire Radeon RX 560
• System Memory: 32GBs
• Display(s): Acer VG271UP
• Type of Diplay Connection: HDMI

System information:

• Distro name and Version: Manjaro 21.1.0
• Kernel version: 5.13.0
• Custom kernel: No, official kernel
• AMD package version: xf86-video-amdgpu, version 19.1.0-2

How to reproduce the issue:

Wake the PC from sleep.

Attached files:

dmesg.log

Xorg.log

Additional info:

The following methods mentioned in ArchWiki can temporarily solve the fault:

It is also possible to forbid the driver so switch to certain P-states, e.g. to workaround problems with deep powersaving P-states like flickering artifacts or stutter. To force the highest VRAM P-state on a Polaris RX 5xx card, while still allowing the GPU itself to run with lower clocks, run:

# echo "manual" > /sys/class/drm/card0/device/power_dpm_force_performance_level
# echo "2" >  /sys/class/drm/card0/device/pp_dpm_mclk

But it seems that I will lose GPU automatic power adjustment?And when I wake up from sleep again, my screen will still flicker.

The flicker caused by waking up from sleep is very similar to the flicker caused by using a command to quickly switch the VRAM frequency.

Sometimes I use the cat command to check the status of pp_dpm_mclk and find that the value of pp_dpm_mclk does change several times in one second.

This looks pretty wrong, doesn't it?