Question Ryzen mobile APU boost all time after wake-up from suspend

[Vitaly_Meerkat]

Hi guys.
I bought a Lenovo E595 laptop with AMD Ryzen 3500U.

Unfortunately, I don't notice when my problem started. After wake-up from suspend in 1-2 minutes core frequency of one CPU core get 2100 MHz, and in 3-4 minutes one core get 3600 MHz and others get 2100 MHz. But it happens even any load on my notebook. I checked it a lot of times. I hate this behavior because fan runs all time and laptop uncharges very fast. Only the one solution I found it's to reboot the OS.

What did I try? (But it didn't solve my problem).
1. Update BIOS (now 1.16).
2. Update kernel to newest (now 5.7.0-050700rc3-generic)
3. Disable boost and HT.
# disable boost
echo 0 > /sys/devices/system/cpu/cpufreq/boost
# disable SMT
echo 0 > /sys/devices/system/cpu/cpu1/online
echo 0 > /sys/devices/system/cpu/cpu3/online
echo 0 > /sys/devices/system/cpu/cpu5/online
echo 0 > /sys/devices/system/cpu/cpu7/online
4. Disable swap.

Some info:
Kubuntu 18.04.
In idle frequency is about 1200MHz (at all cores).
It happens only after wake-up from suspend.
It continues to reboot.

And the worst thing is I don't know where the problem is – in a hardware (laptop board, CPU, BIOS) or in a software (OS, kernel, ect.)

 

[tamz_msc]

Just out of curiosity, have you tried Windows 10, or 20.04 LTS for that matter? With Raven Ridge(Ryzen 2000U) Linux support was spotty at best. Though things have improved with Picasso(Ryzen 3000U), there are still isolated reports citing problems with certain Linux configurations.

 

[Vitaly_Meerkat]

Just out of curiosity, have you tried Windows 10, or 20.04 LTS for that matter?

thank for attention to this question. I updated to Ubuntu 20.04, but nothing changed.

And I found the answer. It was the governors. https://wiki.archlinux.org/index.php/CPU_frequency_scaling
It helps me:

for thread in 0 1 2 3 4 5 6 7; do cpufreq-set -c $thread -g conservative; done