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Hi all,
I have converted an old laptop into a homemade server, and I would like to control the thresholds when the battery starts/stops charging to increase its longevity. I am aware that removing the battery would probably be ideal for maximizing longevity, but I still want to keep the battery.
I have tried two approaches: tlp and smbios-battery-ctl (from libsmbios). However, neither of them have detected my battery correctly. Fastfetch is able to read it, so I am unsure what I'm doing wrong.
Has anybody had any luck before for setting custom charging thresholds on similar dell laptops?
Here's more information on the utilities I've tried:
Libsmbios:
❯ sudo smbios-battery-ctl -v -c
Libsmbios version : 2.4.3
smbios-battery-ctl version : 2.4.3
You can use smbios-battery-ctl utility to view/modify battery settings
Get Charging State : res[smi.cbRES1]=0x0,res[smi.cbRES2]=0x0, res[smi.cbRES3]=0x0
Supported battery charging features:
NIL
Battery charging Status:
NILTLP:
❯ sudo tlp-stat -b
--- TLP 1.6.1 --------------------------------------------
+++ Battery Care
Plugin: generic
Supported features: none available
+++ Battery Status: BAT0
/sys/class/power_supply/BAT0/manufacturer = LGC-LGC3.553
/sys/class/power_supply/BAT0/model_name = DELL 81PF3
/sys/class/power_supply/BAT0/cycle_count = 0 (or not supported)
/sys/class/power_supply/BAT0/charge_full_design = 3680 [mAh]
/sys/class/power_supply/BAT0/charge_full = 3680 [mAh]
/sys/class/power_supply/BAT0/charge_now = 3680 [mAh]
/sys/class/power_supply/BAT0/current_now = 1 [mA]
/sys/class/power_supply/BAT0/status = Full
/sys/class/power_supply/BAT0/charge_control_start_threshold = (not available)
/sys/class/power_supply/BAT0/charge_control_end_threshold = (not available)
Charge = 100.0 [%]
Capacity = 100.0 [%]Just to show fastfetch reads it fine:
❯ fastfetch -l none | grep -i battery
Battery (DELL 81PF3): 100% [AC Connected]Offline
Hi,
the solution is just around the corner: /sys/class/power_supply/BAT0/charge_control_start_threshold, charge_control_end_threshold come with kernel 6.11 (which just arrived in Arch) and will then probably be followed by a Dell plugin in TLP 1.8 - if there are enough brave testers.
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