linux-kernel - Fwd: kernel consumes ~50% more power at idle after resume from s2ram

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Message-ID: <8202e4a3-5228-f0ed-9c40-1f575f944595@gmail.com>
Date:   Wed, 24 May 2023 20:27:27 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Linux Power Management <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:     Huang Rui <ray.huang@....com>,
        Daniel Lezcano <daniel.lezcano@...nel.org>,
        Thomas Renninger <trenn@...e.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Alexey Kunitskiy <alexey.kv@...il.com>
Subject: Fwd: kernel consumes ~50% more power at idle after resume from s2ram

Hi,

I notice a bug report on Bugzilla [1]. As many developers don't keep
an eye on it, I decide to forward it by email. Quoting from it:

> I have a setup for measuring power consumption straight out from AC socket. I'm using following hardware in test setup:
> ASUS A88X-PLUS motherboard / Athlon X4 845 / 16GB DDR3 1600
> a usb sata ssd attached as system disk, no VGA card
> 
> Tested on Debian bullseye kernel 5.10 , bookworm kernel 6.1 and fresh stable 6.3.2 compiled by myself. Results are the same. All attached logs are from 6.3.2
> 
> After a fresh boot, without any interaction such setup consumes ~19W out from power socket. Doing a suspend to ram and after resume power consumption in exact idle use case is increased to 30W and do not come back to value before suspend.
> 
> I was trying using powertop --auto-tune but it had almost no influence on the increased value.

See bugzilla for the full thread and attached debugging logs
(acpidump, lspci, dmesg).

Thanks.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=217455

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