TLP and CPUFreq on ThinkPad P1 Gen 2 (KDE Arch)

· by Victor Mendonça · Read in about 3 min · (528 words) ·

On this tutorial I will show you how to install and configure TLP and Intel P-state and CPUFreq Manager on your ThinkPad P1 Gen 2 (with KDE Arch).

If you don’t know, TLP allows you to configure specific rules to help optimize the battery life on your laptop, while Intel P-state and CPUFreq Manager gives you a pretty interface via a tray icon that allows you to control CPU/GPU frequencies and a few power profiles.

TLP

Using TLP’s threshold functionality we can change the charge thresholds for the battery. On ThinkPads the charging process is controlled by the embedded controller (EC) firmware (instead of software running on the operating system). Lenovo’s default settings start charging when the battery drops below 96%, and stops at 100%. This is good for «performance» but it deteriorates the battery causing a shorter lifespan. By changing the battery charge thresholds with TLP we can extend the lifespan of the battery.

Note: Lithium-ion batteries do not suffer from memory effect like NiCd and NiMH batteries. See the quote below (https://batteryuniversity.com) for an explanation

A lithium-ion battery provides 300-500 discharge/charge cycles. The battery prefers a partial rather than a full discharge. Frequent full discharges should be avoided when possible. Instead, charge the battery more often or use a larger battery. There is no concern of memory when applying unscheduled charges.

Installation

This part is very simple. Install the following packages and then reboot:

=> Main

  • tlp
  • acpi_call
  • smartmontools

=> AUR

  • tlpui-git

Configuration

a. Run tlpui and go to the ‘ThinkPad Battery’ tab on the left

b. Set the following parameters/options

START_CHARGE_THRESH_BAT0

Value = 50/60

This is the threshold of when the battery will start charging. If you set it to 50 the battery will only start charging when it’s below 50%.

STOP_CHARGE_THRESH_BAT0

Value = 70/80

This is the value of when the battery will stop charging. If you set it to 80 the battery will stop charging when close to %80.

RESTORE_THRESHOLDS_ON_BAT

Value = enabled

When you bypass the charge thresholds with a TLP command you would usually need to reboot your machine to reset the thresholds. When RESTORE_THRESHOLDS_ON_BAT is enabled the configured thresholds will be restored when the power is unplugged.

This is useful if you need to fully charge your battery for a meeting, or to work in a place where you know you won’t have a power outlet.

NATACPI_ENABLE

Value = enabled

TPACPI_ENABLE

Value = enabled

TPSMAPI_ENABLE

Value = disabled

tp_smapi doesn’t support newer models, so we need to disable this.

c. Go back to the ‘General’ tab and enable TLP_ENABLE

d. Click on ‘save’ and reboot

Additional TLP Commands

Get a full report from TLP

sudo tlp-stat

Get a report with battery information only

sudo tlp-stat -b

Temporarily bypass the current config and use specified threshold

sudo tlp setcharge [start threshold] [stop threshold]

Bypass thresholds and fully charge battery

sudo tlp fullcharge

Bypass the start threshold and charge up to the stop threshold

sudo tlp chargeonce

Intel P-state and CPUFreq Manager

a. Install plasma5-applets-plasma-pstate (AUR)

b. Add the widget to your panel

c. Done! You should now be able to use the widget for basic control


Reference:

code with