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I've been trying to get battery conservation mode to work by doing the below, but ultimately I have been unable to get the setting to change from 0 to 1

Running kernel 5.11.0-37

Tried previous posted solutions of

echo 1 > /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode

however, when I look at the file ...

cat /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode
0

Trying this using sudo su also had no effect.

Also tried editing the file manually as root, but when reopening the file it is once again set to 0

Tried: TLP, which seems to confirm I can set an upper threshold for my Lenovo 7i, but it also references conservation_mode being set as 0 (100%)

sudo tlp setcharge 80 1

Setting temporary charge threshold for all batteries: conservation mode = 1


sudo tlp-stat -s -b --cdiff
--- TLP 1.4.0 --------------------------------------------

+++ Configured Settings (only differences to defaults):
/etc/tlp.conf L0514: RESTORE_THRESHOLDS_ON_BAT="1"
/etc/tlp.conf L0508: START_CHARGE_THRESH_BAT1="70"
/etc/tlp.conf L0509: STOP_CHARGE_THRESH_BAT1="80"

+++ System Info
System         = LENOVO Lenovo Legion 7 15IMHg05 81YU
BIOS           = E9CN62WW(V4.07)
OS Release     = Linux Mint 20.1
Kernel         = 5.11.0-37-generic #41~20.04.2-Ubuntu SMP Fri Sep 24 09:06:38 UTC 2021 x86_64
/proc/cmdline  = BOOT_IMAGE=/boot/vmlinuz-5.11.0-37-generic root=UUID=0e11e314-e8c7-4281-b1d0-a2e48e32244b ro nomodeset quiet splash nomodeset acpi_osi=! "acpi_osi=Windows 2020"
Init system    = systemd v245 (245.4-4ubuntu3.13)
Boot mode      = UEFI

+++ TLP Status
State          = enabled
RDW state      = enabled
Last run       = 18:07:12,  20084 sec(s) ago
Mode           = AC
Power source   = AC

+++ Battery Care
Plugin: lenovo
Supported features: charge threshold
Driver usage:
* vendor (ideapad_laptop) = active (charge threshold)
Parameter value range:
* STOP_CHARGE_THRESH_BAT0: 0(off), 1(on) -- battery conservation mode

/sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode = 0 (100%)

+++ Battery Status: BAT1
/sys/class/power_supply/BAT1/manufacturer                   = 0x53 0x4D 0x50 0x00 0x32 0x30 0x
/sys/class/power_supply/BAT1/model_name                     = 0x4C 0x31 0x39 0x4D 0x34 0x50 0x8000
/sys/class/power_supply/BAT1/cycle_count                    =     22
/sys/class/power_supply/BAT1/energy_full_design             =  80000 [mWh]
/sys/class/power_supply/BAT1/energy_full                    =  77870 [mWh]
/sys/class/power_supply/BAT1/energy_now                     =  77370 [mWh]
/sys/class/power_supply/BAT1/power_now                      =      0 [mW]
/sys/class/power_supply/BAT1/status                         = Idle

Charge                                                      =   99.4 [%]
Capacity                                                    =   97.3 [%]

If anyone has any possible solutions, explanations on why I cant seem to edit the conservation_mode file, it'd be much appreciated.

Paul N
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4 Answers4

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Unfortunately, the configuration of TLP is not quite intuitive in this case.

The crucial information is in the output of tlp-stat -b.

* STOP_CHARGE_THRESH_BAT0: 0(off), 1(on) -- battery conservation mode

BAT0 because conservation mode applies to all batteries regardless of their name.

For conservation mode you must configure:

STOP_CHARGE_THRESH_BAT0=1

Then use the terminal command

sudo tlp setcharge

Check

sudo tlp-stat -b

Your existing lines may be commented afterwards

/etc/tlp.conf L0508: START_CHARGE_THRESH_BAT1="70"
/etc/tlp.conf L0509: STOP_CHARGE_THRESH_BAT1="80"
linrunner
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  • even after input of: sudo tlp setcharge 80 1, and it confirming setting it to Conservation mode = 1. I get the same output for tlp-stat -b – Paul N Oct 08 '21 at 13:10
  • Then your laptop probably ignores the setting. Strange. – linrunner Oct 11 '21 at 05:27
  • seems to. More so, my confusion is why I cant seem to alter the below even with full permissions. Im at a loss..... /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode – Paul N Oct 12 '21 at 09:34
  • This is only consistent: TLP can't change it and neither can you by hand. – linrunner Oct 14 '21 at 05:52
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A direct and simple solution to your problem would be this:

  1. Check if Ideapad_laptop kernel module is loaded (You don't need to repeat this)

lsmod | grep ideapad_laptop

  1. To know the current status of conservation mode:

(If Output is 1 - conservation mode ON, 0 - conservation mode OFF)

cat /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode

(You may have different name for "VPC2004:00" so check that by going to the folder "ideapad-acpi" by cd command and running ls there)

  1. Use following command to turn on/off the conservation mode : (1 - conservation ON, 0 -conservation OFF)
echo 1 | sudo tee /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode

echo 0 | sudo tee /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode
Ayush Jain
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Edit the file: /etc/default/tlp.conf

  • Uncomment the lines that has START/STOP_CHARGE_THRESH_BAT0/1
  • For non-ThinkPad Lenovo set the START to dummy value of 0 and the STOP to 1
  • For any ThinkPad Lenovo set the START/STOP to any numbers of percentages you want
  • For more info & examples visit:
  • The 3 following steps are optional:
    1. Uncomment the line that has TLP_ENABLE and set it to 1
    2. Uncomment the line that has TLP_WARN_LEVEL and set it to 3
    3. Uncomment the line that has NATACPI_ENABLE driver and set it to 1 (if ThinkPad enable the other 2 drivers as well)

To apply new charging configurations for current session only:

sudo tlp setcharge

To apply new configurations permanently and start tlp in (auto mode):

sudo tlp start

(OPTIONAL) This command will be suggested by tlp start if needed:

sudo systemctl enable tlp.service

Hussein Kandil
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sorry for being late.

I was having the same problem as you but I figured it out here: https://linrunner.de/tlp/settings/bc-vendors.html.

I was using this thread as a guide, I am using arch linux on a ideapad and I managed to fix the problem. The TLP documentation site I linked is very extensive, most problems occur with lenovo and, mainly, thinkpad laptops. But don't worry, you are using an ideapad which uses a different battery firmware.


So, ideapads' batteries cannot have a custom battery threshold; they only accept the **Stop threshold values** which the firmware calls "battery conservation mode". It's boolean so it must be a 1 to enable or a 0 to disable. The **Start threshold values** should be a dummy value of 0.

The "battery conservation mode" functions like a set-in-stone battery threshold. For me, it turned on automatically once I set the STOP threshold to 1. But you may also try

echo 1 | sudo tee /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode

... Such as another user posted. If it does not work, you may need to install the ideapad ACPI package and try again.

TL;DR: Change your STOP to 1 and your start to 0, let the battery discharge to 59% and run sudo tlp-stat -b to check if the battery conservation mode is active.

NOTE: Excuse my english, it's not my first language. Hope it helps.

Ouyama S.
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