Arch Linux

pajamaman18

Member

Registered: 2023-09-07

Posts: 8

Increased power draw compared to kernel 6.14.10.arch1-1

I recently updated my laptop after ~2 weeks and noticed that it was running noticably louder than before, in addition the powerd draw was roughly double when (near) idle (~4-5W -> ~9W).

After some testing with powertop I noticed that my processor package could not go lower than the C3 powerstate.

Reverting to kernel 6.14.10.arch1-1fixed this (package is mostly is in C8).
Both 6.15.1.arch1-2 and 6.15.2.arch1-1 result in worse battery life.

gromit

Administrator

From: Germany

Registered: 2024-02-10

Posts: 1,523

Website

Re: Increased power draw compared to kernel 6.14.10.arch1-1

This could be a kernel regression, which should be bisected and reported to the upstream kernel developers

Are you confident to do the bisection on your own or do you need some help?
If you want we could also provide you with pre-built kernel images for you to test (which greatly speeds up the test time)  

Good info to get you started is:
- https://docs.kernel.org/admin-guide/rep … sions.html
- https://wiki.archlinux.org/title/Kernel … egressions

Also could you check whether the latest mainline release maybe already fixes the issue again?

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-6.16rc2-1-x86_64.pkg.tar.zst

pajamaman18

Member

Registered: 2023-09-07

Posts: 8

Re: Increased power draw compared to kernel 6.14.10.arch1-1

Also could you check whether the latest mainline release maybe already fixes the issue again?

The new kernel seems to fix this problem.
Exactly the same behaviour as 6.14.10-arch1-1.

If you want me to still do a bisect I can try, however I do not have any experience with that.