Calculate power now if missing

[SammysHP]

Some systems don't report power_now in the sysfs, but you can calculate the power from the voltage_now and current_now entries. tlp-stat could calculate the power and include it in the output.

[linrunner]

@SammysHP I've added the feature to the dell plugin. Please test with the issue/820 branch and show the output of

tlp-stat -s -b

[SammysHP]

Almost?

Older version:

--- TLP 1.10.0-alpha.0_380d1bb --------------------------------------------

+++ System Info
System         = Dell Inc.  Precision 7530
BIOS           = 1.42.0 Dell Inc.
OS Release     = Arch Linux
Kernel         = 6.17.9-arch1-1 #1 SMP PREEMPT_DYNAMIC Mon, 24 Nov 2025 15:21:09 +0000 x86_64
/proc/cmdline  = BOOT_IMAGE=/vmlinuz-linux root=UUID=2de3c1f1-0ea0-4524-842e-5b9da823f41e rw splash cryptdevice=PARTUUID=ccac2a0c-468d-4bac-b0be-421f2e078991:cryptroot:allow-discards
Init system    = systemd 258
Boot mode      = UEFI
Suspend mode   = s2idle [deep]

+++ TLP Status
tlp            = enabled, last run: 16:03:39, 123 sec(s) ago
tlp-rdw            = not installed
tlp-pd         = enabled, running
Power profile  = balanced/BAT
Power source   = battery

+++ Battery Care
Plugin: dell
Supported features: charge thresholds
Driver usage:
* natacpi (dell_laptop) = active (charge thresholds)
Parameter value ranges:
* START_CHARGE_THRESH_BAT0/1:  50..95(default)
* STOP_CHARGE_THRESH_BAT0/1:   55..100(default)

+++ Battery Status: BAT0
/sys/class/power_supply/BAT0/manufacturer                   = SMP
/sys/class/power_supply/BAT0/model_name                     = DELL 0WMRC41
/sys/class/power_supply/BAT0/cycle_count                    =      0 (or not supported)
/sys/class/power_supply/BAT0/charge_full_design             =   8509 [mAh]
/sys/class/power_supply/BAT0/charge_full                    =   8084 [mAh]
/sys/class/power_supply/BAT0/charge_now                     =   7917 [mAh]
/sys/class/power_supply/BAT0/current_now                    =    817 [mA]
/sys/class/power_supply/BAT0/status                         = Discharging

/sys/class/power_supply/BAT0/charge_control_start_threshold =     95 [%]
/sys/class/power_supply/BAT0/charge_control_end_threshold   =    100 [%]
/sys/class/power_supply/BAT0/charge_types                   = Trickle Fast Standard Adaptive [Custom]

Charge                                                      =   97.9 [%]
Capacity                                                    =   95.0 [%]

issue/820 branch:

--- TLP 1.10.0-alpha.0_0d9f0e1 --------------------------------------------

+++ System Info
System         = Dell Inc.  Precision 7530
BIOS           = 1.42.0 Dell Inc.
OS Release     = Arch Linux
Kernel         = 6.17.9-arch1-1 #1 SMP PREEMPT_DYNAMIC Mon, 24 Nov 2025 15:21:09 +0000 x86_64
/proc/cmdline  = BOOT_IMAGE=/vmlinuz-linux root=UUID=2de3c1f1-0ea0-4524-842e-5b9da823f41e rw splash cryptdevice=PARTUUID=ccac2a0c-468d-4bac-b0be-421f2e078991:cryptroot:allow-discards
Init system    = systemd 258
Boot mode      = UEFI
Suspend mode   = s2idle [deep]

+++ TLP Status
tlp            = enabled, last run: 16:07:02, 3 sec(s) ago
tlp-rdw            = not installed
tlp-pd         = enabled, running
Power profile  = balanced/BAT
Power source   = battery

+++ Battery Care
Plugin: dell
Supported features: charge thresholds
Driver usage:
* natacpi (dell_laptop) = active (charge thresholds)
Parameter value ranges:
* START_CHARGE_THRESH_BAT0/1:  50..95(default)
* STOP_CHARGE_THRESH_BAT0/1:   55..100(default)

+++ Battery Status: BAT0
/sys/class/power_supply/BAT0/manufacturer                   = SMP
/sys/class/power_supply/BAT0/model_name                     = DELL 0WMRC41
/sys/class/power_supply/BAT0/cycle_count                    =      0 (or not supported)
/sys/class/power_supply/BAT0/charge_full_design             =   8509 [mAh] (   666 mAh)
/sys/class/power_supply/BAT0/charge_full                    =   8084 [mAh] (   632 mAh)
/sys/class/power_supply/BAT0/charge_now                     =   7896 [mAh] (   618 mAh)
/sys/class/power_supply/BAT0/current_now                    =    958 [mA]  (    75 mA)
/sys/class/power_supply/BAT0/status                         = Discharging

/sys/class/power_supply/BAT0/charge_control_start_threshold =     95 [%]
/sys/class/power_supply/BAT0/charge_control_end_threshold   =    100 [%]
/sys/class/power_supply/BAT0/charge_types                   = Trickle Fast Standard Adaptive [Custom]

Charge                                                      =   97.7 [%]
Capacity                                                    =   95.0 [%]

[linrunner]

Oops, mA(h) instead of mW(h). Also forgot to ask for the voltages:

tlp-stat -s -b -v

[SammysHP]

--- TLP 1.10.0-alpha.0_0d9f0e1 --------------------------------------------

+++ System Info
System         = Dell Inc.  Precision 7530
BIOS           = 1.42.0 Dell Inc.
OS Release     = Arch Linux
Kernel         = 6.17.9-arch1-1 #1 SMP PREEMPT_DYNAMIC Mon, 24 Nov 2025 15:21:09 +0000 x86_64
/proc/cmdline  = BOOT_IMAGE=/vmlinuz-linux root=UUID=2de3c1f1-0ea0-4524-842e-5b9da823f41e rw splash cryptdevice=PARTUUID=ccac2a0c-468d-4bac-b0be-421f2e078991:cryptroot:allow-discards
Init system    = systemd 258
Boot mode      = UEFI
Suspend mode   = s2idle [deep]

+++ TLP Status
tlp            = enabled, last run: 18:37:13, 375 sec(s) ago
tlp-rdw            = not installed
tlp-pd         = enabled, running
Power profile  = balanced/BAT
Power source   = battery

+++ Battery Care
Plugin: dell
Supported features: charge thresholds
Driver usage:
* natacpi (dell_laptop) = active (charge thresholds)
Parameter value ranges:
* START_CHARGE_THRESH_BAT0/1:  50..95(default)
* STOP_CHARGE_THRESH_BAT0/1:   55..100(default)

+++ Battery Status: BAT0
/sys/class/power_supply/BAT0/manufacturer                   = SMP
/sys/class/power_supply/BAT0/model_name                     = DELL 0WMRC41
/sys/class/power_supply/BAT0/cycle_count                    =      0 (or not supported)
/sys/class/power_supply/BAT0/charge_full_design             =   8509 [mAh] (106907 mWh)
/sys/class/power_supply/BAT0/charge_full                    =   8084 [mAh] (101567 mWh)
/sys/class/power_supply/BAT0/charge_now                     =   7535 [mAh] ( 94670 mWh)
/sys/class/power_supply/BAT0/current_now                    =    919 [mA]  ( 11546 mW)
/sys/class/power_supply/BAT0/status                         = Discharging

/sys/class/power_supply/BAT0/voltage_min_design             =  11400 [mV]
/sys/class/power_supply/BAT0/voltage_now                    =  12564 [mV]

/sys/class/power_supply/BAT0/charge_control_start_threshold =     95 [%]
/sys/class/power_supply/BAT0/charge_control_end_threshold   =    100 [%]
/sys/class/power_supply/BAT0/charge_types                   = Trickle Fast Standard Adaptive [Custom]

Charge                                                      =   93.2 [%]
Capacity                                                    =   95.0 [%]