On Wed 10 Feb 2016 at 11:32:48 (+0530), Jos Collin wrote: > Hi, I'm not answering your question. But my suggestion is: don't bother about > your battery life. Because even if you get 10 hours now, it is going to reduce > slowly and reach 30 mins or 10 mins with in a few years. Then you have to > replace your battery with a new one. > > I had a battery that drains to 0% with in 30 secs. I replaced that in 2012 > with > a 9 cell battery, when I started traveling with my laptop. The new battery > also > drains to 0% within 30 secs now. > > So I advice you to forget about battery life and move on to other important > things. :-)
The (small size) battery on this laptop contains 42Wh fully charged. Discharging it in 30 seconds would generate 5kW which is two high-power electric kettles in the UK, over three in the US. So either your battery hasn't charged properly, or else it's not discharging properly, probably because there's a duff cell. In the latter case, the battery remains a hazard because it still contains a lot of charge if only it could find a discharge path. > On 10-Feb-2016 11:05 AM, "Dwijesh Gajadur" <dwije...@gmail.com> wrote: > I have a Dell Inspiron 5559 laptop which has a 40WHr, 4-cell battery. On > Windows 7 I get a battery life of 6-7 hours. On Ubuntu I get a battery > life > of 5 hours after using PowerTop. > However on Debian I get only 3 hours of battery life. I have done > calibration several times and for several hours but I get only 3 hours of > battery life. If these timings can be achieved at will, I'd be interested to know if the laptop was running at the same temperature on the various OSes. A poor video driver might waste a lot of power. I suspect this is the case with my own Dell laptop; given the chance it would make a cuppa. I occasionally see the CPU at 96.5°C. > My Question is, is it normal to get the lines: > □ Cannot load from file /var/cache/powertop/saved_parameters.powertop > □ Devfreq not enabled > Is it because of these lines that PowerTop is unable to extend the battery > life? > Debian Stretch is currently using PowerTop version 2.8 and I heard > somewhere on a forum that there is a bug in the 2.8 version. Is it true > that there is a bug ? And is it that bug which is causing the problem? Does https://bugs.debian.org/cgi-bin/pkgreport.cgi?dist=unstable;package=powertop help? Cheers, David.
