Loki Battery Life on ThinkPad T420

Discussion in 'Newbie Questions' started by Xamineh, May 4, 2018.

  1. Xamineh

    Xamineh Thread Starter
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    Hi guys,

    I recently tried to use Elementary OS on my ThinkPad T420. Hardware worked just fine out of the box, wifi, sound, graphics, etc.
    However, battery life on Elementary has been very, very bad! It lasts about an hour tops. I have installed and enabled TLP but it doesn't seem to make any difference.
    Same laptop on Solus, Ubuntu or Mint lasts around 3 hours and on Windows around 4.

    Following PowerTOP report that ran for a couple of minutes with the laptop idle:

    Code (Text):
    PowerTOP 2.8      Overview   Idle stats   Frequency stats   Device stats   Tunables                                

    The battery reports a discharge rate of 13.0 W
    The estimated remaining time is 1 hours, 4 minutes

    Summary: 777.5 wakeups/second,  0.0 GPU ops/seconds, 0.0 VFS ops/sec and 24.0% CPU use

                    Usage       Events/s    Category       Description
                 1981 rpm                   Device         Laptop fan
                 81.5 ms/s     157.9        Process        /opt/google/chrome/chrome --type=renderer --field-trial-handle=14154079299553752411,6608151803463361335,131072 --se
                  5.6 ms/s     113.5        Timer          hrtimer_wakeup
                 22.2 ms/s      96.4        Process        /opt/google/chrome/chrome
                  3.4 ms/s      75.2        Timer          tick_sched_timer
                 17.4 ms/s      55.5        Process        /opt/google/chrome/chrome --type=renderer --field-trial-handle=14154079299553752411,6608151803463361335,131072 --se
                 11.6 ms/s      53.6        Process        /opt/google/chrome/chrome --type=gpu-process --field-trial-handle=14154079299553752411,6608151803463361335,131072 -
                  7.2 ms/s      48.3        Process        gala
                  2.7 ms/s      41.4        Interrupt      PS/2 Touchpad / Keyboard / Mouse
                 46.1 ms/s       5.4        kWork          intel_atomic_commit_work
                220.2 µs/s      21.1        Interrupt      [28] iwlwifi
                  7.1 ms/s      16.0        Process        /usr/lib/xorg/Xorg -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
                196.8 µs/s      14.0        Process        [rcu_sched]
                449.8 µs/s      11.5        Process        [irq/28-iwlwifi]
                  1.3 ms/s      11.6        Interrupt      [25] i915
                  2.4 ms/s      10.9        Interrupt      [7] sched(softirq)
                 13.4 ms/s       0.6        kWork          i915_gem_idle_work_handler
                237.8 µs/s       5.8        kWork          ieee80211_iface_work
                 99.8 µs/s       5.8        Process        [i915/signal:0]
                  1.3 ms/s       4.9        Interrupt      [4] block(softirq)
                 32.9 µs/s       5.0        kWork          console_callback
                354.5 µs/s       3.2        Process        /usr/sbin/acpid
                562.6 µs/s       3.0        Process        wingpanel
                  4.7 ms/s       1.1        Process        /opt/google/chrome/chrome --type=renderer --field-trial-handle=14154079299553752411,6608151803463361335,131072 --se
                 86.5 µs/s       2.6        kWork          iwl_bg_run_time_calib_work
                282.9 µs/s       1.3        Process        plank
                246.7 µs/s       1.1        Process        /opt/google/chrome/chrome --type=renderer --field-trial-handle=14154079299553752411,6608151803463361335,131072 --se
                 16.4 µs/s       1.1        kWork          intel_atomic_helper_free_state_

                  1.7 ms/s      0.30        kWork          disk_events_workfn
                298.2 µs/s       0.6        Process        pantheon-terminal
                 15.4 µs/s       0.7        kWork          pci_pme_list_scan
                  5.5 µs/s       0.7        Timer          sched_rt_period_timer
                223.9 µs/s       0.6        Process        /usr/lib/x86_64-linux-gnu/bamf/bamfdaemon

    <ESC> Exit | <TAB> / <Shift + TAB> Navigate |                                                                      
     
    Any thoughts?

    Thanks,
    Xamineh
     
    #1 Xamineh, May 4, 2018
    Last edited: May 8, 2018
  2. aid

    aid
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    Have you tried PowerTOP ? This will show you which processes / devices are using the most CPU. Once PowerTOP has been started it will take measurements for a while, then it will start showing all your device / processes consumption in terms of wattage. Then you can work out what is draining your battery so fast.

    To install it search in AppCentre or run;
    Code (Text):
    sudo apt install powertop
    PowerTOP is terminal based and will require root privs, so once downloaded to start it run the below;
    Code (Text):
    sudo powertop
     
  3. Xamineh

    Xamineh Thread Starter
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    Hi,

    Thanks for the tip. I let PowerTop running for a while, following the results:

    Code (Text):
    PowerTOP 2.8      Overview   Idle stats   Frequency stats   Device stats   Tunables                                  

    The battery reports a discharge rate of 13.0 W
    The estimated remaining time is 1 hours, 4 minutes

    Summary: 777.5 wakeups/second,  0.0 GPU ops/seconds, 0.0 VFS ops/sec and 24.0% CPU use

                    Usage       Events/s    Category       Description
                 1981 rpm                   Device         Laptop fan
                 81.5 ms/s     157.9        Process        /opt/google/chrome/chrome --type=renderer --field-trial-handle=14154079299553752411,6608151803463361335,131072 --se
                  5.6 ms/s     113.5        Timer          hrtimer_wakeup
                 22.2 ms/s      96.4        Process        /opt/google/chrome/chrome
                  3.4 ms/s      75.2        Timer          tick_sched_timer
                 17.4 ms/s      55.5        Process        /opt/google/chrome/chrome --type=renderer --field-trial-handle=14154079299553752411,6608151803463361335,131072 --se
                 11.6 ms/s      53.6        Process        /opt/google/chrome/chrome --type=gpu-process --field-trial-handle=14154079299553752411,6608151803463361335,131072 -
                  7.2 ms/s      48.3        Process        gala
                  2.7 ms/s      41.4        Interrupt      PS/2 Touchpad / Keyboard / Mouse
                 46.1 ms/s       5.4        kWork          intel_atomic_commit_work
                220.2 µs/s      21.1        Interrupt      [28] iwlwifi
                  7.1 ms/s      16.0        Process        /usr/lib/xorg/Xorg -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
                196.8 µs/s      14.0        Process        [rcu_sched]
                449.8 µs/s      11.5        Process        [irq/28-iwlwifi]
                  1.3 ms/s      11.6        Interrupt      [25] i915
                  2.4 ms/s      10.9        Interrupt      [7] sched(softirq)
                 13.4 ms/s       0.6        kWork          i915_gem_idle_work_handler
                237.8 µs/s       5.8        kWork          ieee80211_iface_work
                 99.8 µs/s       5.8        Process        [i915/signal:0]
                  1.3 ms/s       4.9        Interrupt      [4] block(softirq)
                 32.9 µs/s       5.0        kWork          console_callback
                354.5 µs/s       3.2        Process        /usr/sbin/acpid
                562.6 µs/s       3.0        Process        wingpanel
                  4.7 ms/s       1.1        Process        /opt/google/chrome/chrome --type=renderer --field-trial-handle=14154079299553752411,6608151803463361335,131072 --se
                 86.5 µs/s       2.6        kWork          iwl_bg_run_time_calib_work
                282.9 µs/s       1.3        Process        plank
                246.7 µs/s       1.1        Process        /opt/google/chrome/chrome --type=renderer --field-trial-handle=14154079299553752411,6608151803463361335,131072 --se
                 16.4 µs/s       1.1        kWork          intel_atomic_helper_free_state_

                  1.7 ms/s      0.30        kWork          disk_events_workfn
                298.2 µs/s       0.6        Process        pantheon-terminal
                 15.4 µs/s       0.7        kWork          pci_pme_list_scan
                  5.5 µs/s       0.7        Timer          sched_rt_period_timer
                223.9 µs/s       0.6        Process        /usr/lib/x86_64-linux-gnu/bamf/bamfdaemon

    <ESC> Exit | <TAB> / <Shift + TAB> Navigate |                                                                        
     
    I took around 10 minutes to install it, let it run and post this. I lost around 15% of battery for that.

    FYI, my T420 specs are: i5 2520M, 8GB RAM DDR3, intel 3000 graphics
     
    #3 Xamineh, May 5, 2018
    Last edited: May 5, 2018
  4. Xamineh

    Xamineh Thread Starter
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    I reinstalled the system and the issue remains.
    Does anyone know what this might be?

    Thanks!
     
  5. aid

    aid
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    Well Chrome is a known CPU hog and can't possibly be used if you want the battery to last long. Do you notice your fan going close to max a lot when in Chrome also? I would try Chromium or even Firefox and that see how longer battery you get then.
     
  6. Xamineh

    Xamineh Thread Starter
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    I tried Firefox and the result is the same, unfortunately. Regarding the fan, the laptop is actually running pretty cold and low fan speed, can't barely hear it.
     

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