linux-kernel - Re: [REGRESSION] Intel Turbo Boost stuck disabled on some Clevo machines (was: [PATCH] cpufreq: intel_pstate: Unchecked MSR aceess in legacy mode)

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Message-ID: <db92b8a310d88214e2045a73d3da6d0ffe8606f7.camel@linux.intel.com>
Date: Thu, 06 Nov 2025 07:23:14 -0800
From: srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
To: Aaron Rainbolt <arainbolt@...cus.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, viresh.kumar@...aro.org, 
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
 stable@...r.kernel.org, 	mmikowski@...cus.org
Subject: Re: [REGRESSION] Intel Turbo Boost stuck disabled on some Clevo
 machines (was: [PATCH] cpufreq: intel_pstate: Unchecked MSR aceess in
 legacy mode)

Hi Aaron,

On Wed, 2025-09-10 at 15:33 -0500, Aaron Rainbolt wrote:
> On Wed, 10 Sep 2025 10:15:00 -0700
> srinivas pandruvada <srinivas.pandruvada@...ux.intel.com> wrote:
> 
> > On Wed, 2025-09-10 at 11:36 -0500, Aaron Rainbolt wrote:
> > > On Wed, 30 Apr 2025 16:29:09 +0200
> > > "Rafael J. Wysocki" <rafael@...nel.org> wrote:
> > >   
> > > > On Tue, Apr 29, 2025 at 11:07 PM Srinivas Pandruvada
> > > > <srinivas.pandruvada@...ux.intel.com> wrote:  
> > > > > 
> > > > > When turbo mode is unavailable on a Skylake-X system,
> > > > > executing
> > > > > the
> > > > > command:
> > > > > "echo 1 > /sys/devices/system/cpu/intel_pstate/no_turbo"
> > > > > results in an unchecked MSR access error: WRMSR to 0x199
> > > > > (attempted to write 0x0000000100001300).
Please try the attached patch, if this address this issue.

Thanks,
Srinivas

View attachment "0001-cpufreq-intel_pstate-Reevaluate-IDA-presence-on-no_t.patch" of type "text/x-patch" (1494 bytes)