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

[Luke Nowakowski-Krijger]

Acked-by: Luke Nowakowski-Krijger <luke.nowakowskikrijger at canonical.com>

On Wed, Apr 5, 2023 at 9:48 PM Michael Reed <michael.reed at canonical.com>
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(-)
>
> --
> 2.34.1
>
>
> --
> kernel-team mailing list
> kernel-team at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/kernel-team
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/kernel-team/attachments/20230511/f349915d/attachment.html>