Power Draw
#1
Hi,

I got my Pinebook Pro 2 days ago and so far I appear to get slightly less than 2 hours of battery life. I have seen others write that they get 8-10 hours so I am wondering what can be done. energy-rate is between 15-20 W when ony doing light web browsing with the screen at a very low brightness. I have attached a upower -d log. Thanks.


Code:
Device: /org/freedesktop/UPower/devices/line_power_dc_charger
 native-path:          dc-charger
 power supply:         yes
 updated:              Wed Jan  1 08:24:41 2020 (12 seconds ago)
 has history:          no
 has statistics:       no
 line-power
   warning-level:       none
   online:              no
   icon-name:          'ac-adapter-symbolic'

Device: /org/freedesktop/UPower/devices/battery_rk_bat
 native-path:          rk-bat
 power supply:         yes
 updated:              Wed Jan  1 08:24:51 2020 (2 seconds ago)
 has history:          yes
 has statistics:       yes
 battery
   present:             yes
   rechargeable:        yes
   state:               discharging
   warning-level:       none
   energy:              34.5379 Wh
   energy-empty:        0 Wh
   energy-full:         40.1604 Wh
   energy-full-design:  0 Wh
   energy-rate:         15.9406 W
   voltage:             4.098 V
   time to empty:       2.2 hours
   percentage:          86%
   temperature:         18.8 degrees C
   capacity:            100%
   technology:          lithium-ion
   icon-name:          'battery-full-symbolic'
 History (charge):
   1577867091 86.000 discharging
 History (rate):
   1577867091 15.941 discharging
   1577867085 16.719 discharging

Device: /org/freedesktop/UPower/devices/line_power_universal_usb
 native-path:          universal_usb
 power supply:         yes
 updated:              Wed Jan  1 08:24:41 2020 (12 seconds ago)
 has history:          no
 has statistics:       no
 line-power
   warning-level:       none
   online:              no
   icon-name:          'ac-adapter-symbolic'

Device: /org/freedesktop/UPower/devices/DisplayDevice
 power supply:         yes
 updated:              Wed Jan  1 08:24:50 2020 (3 seconds ago)
 has history:          no
 has statistics:       no
 battery
   present:             yes
   state:               discharging
   warning-level:       none
   energy:              34.5379 Wh
   energy-full:         40.1604 Wh
   energy-rate:         15.9406 W
   time to empty:       2.2 hours
   percentage:          86%
   icon-name:          'battery-full-symbolic'

Daemon:
 daemon-version:  0.99.4
 on-battery:      yes
 lid-is-closed:   no
 lid-is-present:  yes
 critical-action: PowerOff
  Reply
#2
Sorry, managed to post this thread on the wrong forum. Should be in the pinebook pro one.
  Reply
#3
(01-01-2020, 02:29 AM)Heuristics Wrote: I got my Pinebook Pro 2 days ago and so far I appear to get slightly less than 2 hours of battery life. I have seen others write that they get 8-10 hours so I am wondering what can be done. energy-rate is between 15-20 W when ony doing light web browsing with the screen at a very low brightness. I have attached a upower -d log. Thanks.

It should be around half that.  Is anything else plugged into it?  What are your CPU settings?
  Reply
#4
I looked into the CPU settings a little and from what I now understand you need to view the cpu as having two parts that you can set the speed on, previously I thought the speed setting in the desktop applet in the lower right corner set it globally. Adding one more applet and having them set to CPU 0 and CPU 5 appears to do the trick. Setting them both to "on demand" brings power draw down to about 8-10 W. A big improvement but still far from 10 hour battery life (if lucky maybe I will get 4-5 hours with light usage). Setting both to "powersave" means it remains around 8-9 W.

I don't have anything plugged in. Any ideas what else can be done? Thank you.
  Reply
#5
I got my Pinebook Pro this week. After I fixed my ANSI keyboard mapping and then I saw this post.

So I decided to do a power consumption test run on my Pinebook Pro.

Objective: very light usage + headless test run
Run time: 10 hours
Result: run for 10 hours and still have 11% battery left

Here is what I did: (I use the "on demand" power scheme)

1. turn off the machine and fully charge the Pinebook Pro overnight before the testing start.

2. Power on the Pinebook Pro, start 2 apps: Power Statistics and System Monitor and let it run. Also start a terminal running the top command.

3. I let the Pinebook Pro idle with the above 3 apps running. After a while the screen switch off.

4. I went to work and logon to my Pinebook Pro via ssh terminal.

5. I continuously check the power level and cpu temperature. (temperation is average at 33.33 degrees C)

6. The battery power level drop 1% after every 7 minutes.

7. After three hours, I wrote another assembly program as below.

Code:
       .global _start
_start:
       mov     r1,#0x25        @ r1 = 0x25
       mov     r2,#0x34        @ r2 = 0x34
       add     r3,r2,r1        @ r3 = r2 + r1
here:   b       here            @ loop forever here

This is an endless looping program, the objective is to use up one cpu core and see how it impact the battery and temperature.

I compiled this program and run it on the background.

I run the "top" command on my terminal and see the program used up 100% cpu. So one core has been fully occupied.

The cpu temperature rised from 33.33 to 46.1 degrees.

I let the program ran for 45 minutes before I killed the process. During the program running time, the power consumption increase to every 1% power drop, took 5 minutes. The temperature also dropped slowly.

I run the "top" command on the ssh terminal until the rest of the test.

Then I let the Pinebook Pro run as headless Linux machine.

After 10 hours, I still have 11% battery left. I stopped the test.
  Reply
#6
@Heuristics this is quite a big power draw that you have. On mine (with nvme drive installed) I have observed power draw as low as 3,58W sometimes.
I am using schedutil cpufreq governor.
  Reply


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