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[homepage.git] / blog / archive / 2016 / 05 / 05.rss

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                 <link>http://people.skolelinux.org/pere/blog/</link>
 
        
+       <item>
+               <title>Discharge rate estimate in new battery statistics collector for Debian</title>
+               <link>http://people.skolelinux.org/pere/blog/Discharge_rate_estimate_in_new_battery_statistics_collector_for_Debian.html</link>        
+               <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Discharge_rate_estimate_in_new_battery_statistics_collector_for_Debian.html</guid>
+                <pubDate>Mon, 23 May 2016 09:35:00 +0200</pubDate>
+               <description>&lt;p&gt;Yesterday I updated the
+&lt;a href=&quot;https://tracker.debian.org/pkg/battery-stats&quot;&gt;battery-stats
+package in Debian&lt;/a&gt; with a few patches sent to me by skilled and
+enterprising users.  There were some nice user and visible changes.
+First of all, both desktop menu entries now work.  A design flaw in
+one of the script made the history graph fail to show up (its PNG was
+dumped in ~/.xsession-errors) if no controlling TTY was available.
+The script worked when called from the command line, but not when
+called from the desktop menu.  I changed this to look for a DISPLAY
+variable or a TTY before deciding where to draw the graph, and now the
+graph window pop up as expected.&lt;/p&gt;
+
+&lt;p&gt;The next new feature is a discharge rate estimator in one of the
+graphs (the one showing the last few hours).  New is also the user of
+colours showing charging in blue and discharge in red.  The percentages
+of this graph is relative to last full charge, not battery design
+capacity.&lt;/p&gt;
+
+&lt;p align=&quot;center&quot;&gt;&lt;img src=&quot;http://people.skolelinux.org/pere/blog/images/2016-05-23-battery-stats-rate.png&quot;/&gt;&lt;/p&gt;
+
+&lt;p&gt;The other graph show the entire history of the collected battery
+statistics, comparing it to the design capacity of the battery to
+visualise how the battery life time get shorter over time.  The red
+line in this graph is what the previous graph considers 100 percent:
+
+&lt;p align=&quot;center&quot;&gt;&lt;img src=&quot;http://people.skolelinux.org/pere/blog/images/2016-05-23-battery-stats-history.png&quot;/&gt;&lt;/p&gt;
+
+&lt;p&gt;In this graph you can see that I only charge the battery to 80
+percent of last full capacity, and how the capacity of the battery is
+shrinking. :(&lt;/p&gt;
+
+&lt;p&gt;The last new feature is in the collector, which now will handle
+more hardware models.  On some hardware, Linux power supply
+information is stored in /sys/class/power_supply/ACAD/, while the
+collector previously only looked in /sys/class/power_supply/AC/.  Now
+both are checked to figure if there is power connected to the
+machine.&lt;/p&gt;
+
+&lt;p&gt;If you are interested in how your laptop battery is doing, please
+check out the
+&lt;a href=&quot;https://tracker.debian.org/pkg/battery-stats&quot;&gt;battery-stats&lt;/a&gt;
+in Debian unstable, or rebuild it on Jessie to get it working on
+Debian stable. :) The upstream source is available from &lt;a
+href=&quot;https://github.com/petterreinholdtsen/battery-stats&quot;&gt;github&lt;/a&gt;.
+Patches are very welcome.&lt;/p&gt;
+
+&lt;p&gt;As usual, if you use Bitcoin and want to show your support of my
+activities, please send Bitcoin donations to my address
+&lt;b&gt;&lt;a href=&quot;bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&quot;&gt;15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&lt;/a&gt;&lt;/b&gt;.&lt;/p&gt;
+</description>
+       </item>
+       
        <item>
                <title>French edition of Lawrence Lessigs book Cultura Libre on Amazon and Barnes &amp; Noble</title>
                <link>http://people.skolelinux.org/pere/blog/French_edition_of_Lawrence_Lessigs_book_Cultura_Libre_on_Amazon_and_Barnes___Noble.html</link>