This attribute accepts a range from 0 through 4 where larger values
will also have larger panel power savings.
Using this has a trade off for color accuracy, and it is only applied
when the system is currently operating on battery.
Intentionally the plugin will check what values are already programmed
to the sysfs file to avoid unnecessary writes. Writing the sysfs file
will cause a modeset which isn't necessary if writing the same value twice.
The default values are applied to the profiles that are used in
power-profiles-daemon compatbility. They also match the values used in
that software.
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Resolves: RHEL-16966
At this point, the plugin supports setting a single sysfs attribute,
platform_profile.
The 3 basic ACPI platform profiles are low-power, balanced, and
performance. These are mapped to the generic powersave,
balanced, and *-performance TuneD profiles.
New kernels (5.13 and newer) moved some sched_ and numa_ knobs from
the sysctl to the debugfs, thus add and abstract these knobs under the
scheduler plugin. With help of this abstraction it will write
the tuning to the correct place according to the kernel used.
Example:
[scheduler]
sched_migration_cost_ns = 500000
Will work on the old kernel the same way as:
[sysctl]
kernel.sched_migration_cost_ns = 500000
I.e. it will write '500000' to the:
/proc/sys/kernel/sched_migration_cost_ns
And on the new kernel it will write '500000' to the:
/sys/kernel/debug/sched/migration_cost_ns
Also updated TuneD profiles.
Resolves: rhbz#1952687
Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
