linux-kernel - Re: Fwd: Abnormal battery drain with kernel 6.5 (Ryzen 5500u)

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Message-ID: <ZUNYNEnGC8cm6ALH@debian.me>
Date:   Thu, 2 Nov 2023 15:05:08 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Huang Rui <ray.huang@....com>, Meng Li <li.meng@....com>,
        Perry Yuan <Perry.Yuan@....com>,
        Mateusz Guzik <mjguzik@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Michele Della Guardia <micheledellaguardia@...oo.it>,
        Linux Power Management <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>
Subject: Re: Fwd: Abnormal battery drain with kernel 6.5 (Ryzen 5500u)

On Fri, Sep 08, 2023 at 12:41:14PM +0800, Huang Rui wrote:
> On Fri, Sep 01, 2023 at 05:42:22PM +0800, Bagas Sanjaya wrote:
> > Hi,
> > 
> > I notice a regression report on Bugzilla [1] that have been already handled
> > there. Quoting from it:
> > 
> > > After switching from 6.4.x kernel to 6.5 I experienced an abnormal battery drain since my laptop is actually never idle.
> > > I accepted default CPUfreq to schedutil and AMD Processor P-State mode is 3 (active). 
> > > 
> > > I expected a different behaviour, but am I missing something?
> > > In my boot configuration I had "amd_pstate.shared_mem=1" and tried to remove this switch, but did not affect my power consuption.
> > > 
> > > Is there something changed from 6.4.x to 6.5 that requires a different configuration to get an optimal power consumption?
> > > 
> > > Thanks a lot for your attention
> > 
> > See Bugzilla for the full thread.
> > 
> > Anyway, I'm adding it to regzbot:
> > 
> > #regzbot introduced: v6.4..v6.5 https://bugzilla.kernel.org/show_bug.cgi?id=217853
> > 
> 
> + Meng Li/Perry,
> 
> May we know which CPU type are you using? Try "lscpu"?
> 

Sorry for the replying just now.

The reporter (on Bugzilla) had bisected to commit c8afaa1b0f8bc9 ("locking:
remove spin_lock_prefetch"). Telling regzbot:

#regzbot introduced: c8afaa1b0f8bc9
#regzbot title: spin_lock_prefetch() removal causes abnormal battery drain on Ryzen 5500u

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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