[Bug 2088733] Re: low CPU frequency after wake up AMD Ryzen

Can you tell me how many times you unplugged and plugged power adapter
during that log?

I see that hardware left s0i3 state 4 times over the one suspend cycle:

> 2024-11-19 21:47:42,898 INFO: ○ Hardware sleep cycle count: 4

I'm wondering if it's 1:1 mapping that it woke up and went back to
hardware sleep state or this prevented it from going back to HW sleep
state. Each time it woke up it would have:

> PM: Triggering wakeup from IRQ 9

You can do some more experiments on your side to understand the
behavior. But I feel there are one of two things happening.

1) The EC (which woke the system from the power adapter event) has a bug with how it handles this event.
2) The Linux kernel (which reacts to the EC SCI) should be doing something more with the wakeup event than what it does with advancing EC transactions.

I feel it's /more likely/ a bug with the EC.

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https://bugs.launchpad.net/bugs/2088733

Title:
low CPU frequency after wake up AMD Ryzen

Status in linux package in Ubuntu:
New

Bug description:
After wake up I can see at least once a week issue with CPU frequency
not going up. When running:

$ watch lscpu -e=CPU,MHZ

standard output looks like:

CPU MHZ
0 400.0000
1 1383.2480
2 400.0000
3 400.0000
4 400.0000
5 2699.7561
6 1288.0500
7 400.0000
8 400.0000
9 400.0000
10 400.0000
11 400.0000
12 3244.0720
13 400.0000
14 400.0000
15 1295.9050

while when the issue occurs, I can't see 600 Mhz or higher values in
the same graph. Which also means that response time of computer is
much lower and everything feels lazy.

Restart fixes the issue or plug power cable off and in again.

My CPU is AMD Ryzen™ 7 PRO 7840HS w/ Radeon™ 780M Graphics × 16
My kernel version: 6.8.0-48-generic #48-Ubuntu SMP PREEMPT_DYNAMIC Fri Sep 27 14:04:52 UTC 2024
OS version: Ubuntu 24.04.1 LTS
My laptop: HP ZBook Firefly 14 inch G10 A Mobile Workstation PC

I know about one more person with same machine type with the issue and
there is also this question on askubuntu which says there is third
person with this issue.

https://askubuntu.com/questions/1531956/cpu-too-slow-after-waking-up-
in-ubuntu-24-04-1

This bug looks pretty similar however should be fixed already, so creating new one
https://bugs.launchpad.net/ubuntu/+source/linux-hwe-5.19/+bug/2007718

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