ACK: [SRU J/K][PATCH V2 0/1] Performance per Watt (DAPC) enabled in the BIOS

[Tim Gardner]

On 4/5/23 1:48 PM, Michael Reed wrote:
> From: Michael Reed <Michael.Reed at canonical.com>
> 
> SRU Justification:
> 
> BugLink: https://bugs.launchpad.net/bugs/2008527
> 
> [Impact]
> 
> A Dell system that has a profile setting of "Performance Per Watt (DAPC)" enabled in the BIOS and running Ubuntu-22.04 does not boot into OS as quickly as expected.
> 
> How reproducible:
> 
> Steps to Reproduce:
> 
> 1. On the Dell system enable "Performance Per Watt (DAPC)" from BIOS.
> 2. Install Ubuntu-22.04
> 3. Boot into OS
> 4. Check the bootup time
> 
> Expected results:
> OS should boot normally and need to consume less bootup time
> 
> [Fix]
> 
> 13fdbc8b8da6 cpufreq: ACPI: Defer setting boost MSRs
> 
> [Test Plan]
> 
> 1. Set system profile as "Performance Per Watt (DAPC)" from BIOS setting
> 2. Install Ubuntu-22.04
> 3. Boot into OS
> 4. Check the bootup time
> 
> [Where problems could occur]
> 
> Regression risk: low to medium.
> 
> [Other Info]
> Jammy
> https://code.launchpad.net/~mreed8855/ubuntu/+source/linux/+git/jammy/+ref/lp_2008527_dapc
> 
> Kinetic
> https://code.launchpad.net/~mreed8855/ubuntu/+source/linux/+git/kinetic/+ref/lp_2008527_dapc_kinetic
> 
> Stuart Hayes (1):
>    cpufreq: ACPI: Defer setting boost MSRs
> 
>   drivers/cpufreq/acpi-cpufreq.c | 31 +++----------------------------
>   1 file changed, 3 insertions(+), 28 deletions(-)
> 
Acked-by: Tim Gardner <tim.gardner at canonical.com>
-- 
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Tim Gardner
Canonical, Inc