linux-kernel - Re: [PATCH v1 2/6] cpufreq: intel_pstate: Do not update global.turbo

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Date: Tue, 04 Jun 2024 01:44:08 +0800
From: Xi Ruoyao <xry111@...111.site>
To: srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>, "Rafael J.
 Wysocki" <rjw@...ysocki.net>, Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/6] cpufreq: intel_pstate: Do not update
 global.turbo_disabled after initialization

On Mon, 2024-06-03 at 10:11 -0700, srinivas pandruvada wrote:
> On Mon, 2024-06-03 at 21:12 +0800, Xi Ruoyao wrote:
> > On Sun, 2024-06-02 at 16:11 -0700, srinivas pandruvada wrote:
> > 
> > /* snip */
> > 
> > > What is the output of:
> > > grep . /sys/devices/system/cpu/intel_pstate/*
> > > 
> > > Also 
> > > rdmsr 0x771
> > > rdmsr 0x774
> > > 
> > > 
> > > Try these three patches. Don't worry about the commit description
> > > for
> > > this issue.
> > 
> > Unfortunately they still do not fix the issue for me.
> > 
> > The outputs of grep and rdmsr commands are initially:
> > 
> > /sys/devices/system/cpu/intel_pstate/hwp_dynamic_boost:0
> > /sys/devices/system/cpu/intel_pstate/max_perf_pct:100
> > /sys/devices/system/cpu/intel_pstate/min_perf_pct:9
> > /sys/devices/system/cpu/intel_pstate/no_turbo:1
> > /sys/devices/system/cpu/intel_pstate/num_pstates:41
> > /sys/devices/system/cpu/intel_pstate/status:active
> > /sys/devices/system/cpu/intel_pstate/turbo_pct:33
> > rdmsr 0x771: 10d1f2c
> > rdmsr 0x774: 1f04
> > 
> > But it then changes to:
> > 
> > /sys/devices/system/cpu/intel_pstate/hwp_dynamic_boost:0
> > /sys/devices/system/cpu/intel_pstate/max_perf_pct:100
> > /sys/devices/system/cpu/intel_pstate/min_perf_pct:9
> > /sys/devices/system/cpu/intel_pstate/no_turbo:1
> > /sys/devices/system/cpu/intel_pstate/num_pstates:41
> > /sys/devices/system/cpu/intel_pstate/status:active
> > /sys/devices/system/cpu/intel_pstate/turbo_pct:33
> > rdmsr 0x771: 10c1f2c
> > rdmsr 0x774: 1f04
> > 
> > It seems only the output of rdmsr 0x771 has changed.  And if I read
> > the
> > SDM correctly it's a "Most_Efficient_Performance" change.
> That is fine.
> 
> We don't have any notifications either via ACPI or via HWP interrupt.
> I think it was working by chance before this change as by the cpufreq
> core is trying to set policy, the turbo is enabled by the firmware.
> 
> What is this laptop make and model?

It's a Hasee X5-2021S5H.

Hasee is known for producing some laptops very cheap but often having
"minor" issues.  So I guess the firmware is doing some stupid thing.

But turbo works just fine on Windows 11 so it'd be better if we could
make it work for Linux too.


-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University