Problem with Lenovo battery threshold
Solution 1
The battery conservation mode is enabled with:
$ echo '\_SB.PCI0.LPCB.EC0.VPC0.SBMC 3' | sudo tee /proc/acpi/call
It can be disable with:
$ echo '\_SB.PCI0.LPCB.EC0.VPC0.SBMC 5' | sudo tee /proc/acpi/call
On Debian/Ubuntu you should install the package acpi-call-dkms
(Credits: ArchLinux wiki - Lenovo IdeaPad 720s)
The just mentioned wiki page refers to the IdeaPad 720s, on my IdeaPad 320 I've double check on the BIOS DSDT table and it seems to be the same. Browsing the web, I've found a case where the proper code to enable it was 4 (instead of 3) but 5 was used to disable it in any case.
Edit Edit Edit
The battery conservation mode is now exposed via the kernel module ideapad-laptop
, so just load the module and then use:
# to read the current status
cat /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode
# to enable
echo 1 > /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode
# to disable
echo 0 > /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode
Solution 2
to manage conservation mode from linux there is a gnome extension that does the monitoring and switching (like Lenovo vintage on windows)
there is a also a manual method
::::::::: Conservative mode commands ::::::::
from terminal
sudo su
write password
reading the current status:
cat /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode
enable Conservation mode:
echo 1 > /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode
disable conservation mode:
echo 0 > /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode
Solution 3
The question asks how to disable conservation mode. My issue was the opposite: I wanted to activate conservation mode. After booting I was always having 0 and going to 100% in the battery charge.
If you run cat /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode
,
you will get 1
or 0
as the output. 1
means conservation_mode
is activated. 0
means it's disabled.
To enable conservation mode, my solution was to edit this file:
sudo gedit /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode
and change 1
to 0
.
While this solved my problem, I still could not figure out how to make the change permanent in Windows or Ubuntu.
Solution 4
The simple solution would be to reboot Windows 10 and set the threshold to 100%.
You should always keep Windows installed (but reduce it's size) so you can install new drivers, boot into it if Ubuntu breaks and as you point out to change battery charge threshold.
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Fabio Giannetti
Updated on September 18, 2022Comments
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Fabio Giannetti over 1 year
I recently installed Linux on my Lenovo Ideapad 320, but I forgot to disable conservation mode from Lenovo vantage with Windows 10. The problem is that now my PC doesn't charge over 60%. I already tried with tlp but it doesn't seem to work.
How can I return to default thresholds (100%)?
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Arpit Anand almost 3 yearsThank you!Thank you! I was search this for months. This answer should be more accessible to anybody who is searching. This works for all Ideapads and Legions.
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Arpit Anand almost 3 yearsAnd this should be the accepted answer!