Thanks fo reporting, this is actually good practice, so that others can benefit.
Loredana On Thu, 2016-02-11 at 09:33 +0400, Dwijesh Gajadur wrote: > Guys, I am glad to tell you that my problem has been solved. > > The problem was actually with my AMD GPU. Thank you Arian, for driving > my attention on the GPU. > > I followed the instructions on > https://wiki.debian.org/AtiHowTo#Debian_Stretch_.28testing.29 > > and installed the missing firmwares and packages. After that I ran > powertop --calibrate and then powertop --auto-tune. > > I can now get a battery life of up to 6-7 hr on Debian 😁 > > > What happened according to me was that PowerTop was not able to detect > my AMD GPU as the required firmware was not installed. After > installing the firmware, PowerTop was able to calibrate properly and > take the correct measurements. > > > Richard Owlett wrote: > > >Please note use of present tense. > >I see two possible interpretations: > > 1. he has a multi-boot installation. In which case he is NOW > getting longer run > > times in Windows and Ubuntu than in Debian. > > 2. he did a clean install of Debian and saw an IMMEDIATE decrease > in run time. > > >If that is not so, I ask Mr. Gajadur to clarify. > > > Yes I actually have a dual boot installation. I first Dual booted > Windows 7 and Debian 9. After finding that the battery life on Debian > was only 3 hr, I replaced the Debian installation with Ubuntu 15.10 > installation just to see how the battery life is on Ubuntu. I found > that I could get a battery life of up to 5hr after using PowerTop on > Ubuntu. However I am not a fan of Ubuntu. Debian is the only linux > distro I love. So I removed Ubuntu and re-installed Debian and tried > to find out what was causing the low battery life on Debian. > > But now there is nothing to worry about as the problem has been solved > thanks to Arian. > > > > I want to thank you all for your comments and help 😀 > > > Best Regards, > > > Dwijesh > > > > > On Wed, Feb 10, 2016 at 11:39 PM, David Wright > <deb...@lionunicorn.co.uk> wrote: > 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. > > >
