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

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Message-ID: <ZPql6tqBCnXJh64J@amd.com>
Date:   Fri, 8 Sep 2023 12:41:14 +0800
From:   Huang Rui <ray.huang@....com>
To:     Bagas Sanjaya <bagasdotme@...il.com>, Meng Li <li.meng@....com>,
        Perry Yuan <Perry.Yuan@....com>
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 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"?

Thanks,
Ray