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

[Michael Reed]

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]

https://code.launchpad.net/~mreed8855/ubuntu/+source/linux/+git/jammy/+ref/lp_2008527_dapc

Stuart Hayes (1):
  cpufreq: ACPI: Defer setting boost MSRs

 drivers/cpufreq/acpi-cpufreq.c | 31 +++----------------------------
 1 file changed, 3 insertions(+), 28 deletions(-)

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2.34.1