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FW16 EC slows the CPU down #43

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@jcdutton

Description

@jcdutton

Device Information

System Model or SKU

[ ] Framework Laptop 16 (AMD Ryzen™ 7040 Series)
No dGPU.

BIOS VERSION

3.0.5

Windows:
N/A

Linux:
Open a terminal and run the following command
sudo dmidecode --string bios-version
03.05

DIY Edition information

Memory: Manufacture and SKU
Kingston Fury Impact: Part Number: KF556S40-32
2x making 64GB total.
Storage: Manufacture and SKU
Model Number: WD_BLACK SN850X 1000GB
Firmware Version: 620361WD

Port/Peripheral information

  1. USB-C card, nothing plugged in.
  2. Empty
  3. Empty
  4. Empty
  5. USB-C card, FW16 PSU plugged in.
  6. USB-A card, nothing plugged in.

Standalone Operation

Are you running your mainboard as a standalone device. Is standalone mode enabled in the BIOS?

  • No

Describe the bug

As discovered when I was working on
#41
It is possible for the EC embedded controller to slow the laptop CPU down.
This happens when the EC is busy doing something.
This Issue is a placeholder to try and investigate where the link is between the CPU and the EC. What is causing the slow down? So we can fix it so that the EC cannot slow the CPU down when one does not wish the EC to slow the CPU down.
If anyone can provide ideas of where in the Linux kernel to start looking for the link, it would be helpful.
Some user applications such as "Real Time Audio", "Digital Audio Workstation", "DAW" would benefit as they rely on low latency for audio input, real time processing and output.

Steps To Reproduce

Steps to reproduce the behavior:

  1. TBD

Expected behavior

The EC should not slow the CPU down, unless intended to. E.g. Setting "Power Modes" from "Performance" to "Power Saver."

Screenshots

N/A

Operating System (please complete the following information):

  • OS/Distribution: Linux/Ubuntu
  • Version: 24.04
  • Linux Kernel Version: uname -a 6.12.7 <- Mainline compiled kernel.

Additional context

Add any other context about the problem here.

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