<channel>
<title>Petter Reinholdtsen - Entries from September 2015</title>
<description>Entries from September 2015</description>
- <link>http://people.skolelinux.org/pere/blog/</link>
+ <link>https://people.skolelinux.org/pere/blog/</link>
<item>
<title>The life and death of a laptop battery</title>
- <link>http://people.skolelinux.org/pere/blog/The_life_and_death_of_a_laptop_battery.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/The_life_and_death_of_a_laptop_battery.html</guid>
+ <link>https://people.skolelinux.org/pere/blog/The_life_and_death_of_a_laptop_battery.html</link>
+ <guid isPermaLink="true">https://people.skolelinux.org/pere/blog/The_life_and_death_of_a_laptop_battery.html</guid>
<pubDate>Thu, 24 Sep 2015 16:00:00 +0200</pubDate>
<description><p>When I get a new laptop, the battery life time at the start is OK.
But this do not last. The last few laptops gave me a feeling that
battery stats ever since. Now my
/var/log/hjemmenett-battery-status.log file contain around 115,000
measurements, from the time the battery was working great until now,
-when it is unable to charge above 7% of original capasity. My
-colletor shell script is quite simple and look like this:</p>
+when it is unable to charge above 7% of original capacity. My
+collector shell script is quite simple and look like this:</p>
<pre>
#!/bin/sh
log_battery() {
# Print complete message in one echo call, to avoid race condition
- # when several log processes run in parallell.
+ # when several log processes run in parallel.
msg=$(printf "%s," $(date +%s); \
for f in $files; do \
printf "%s," $(cat $f); \
</pre>
<p>I wrote a small script to create a graph of the charge development
-over time. This graph depicted above show the slow death of mylaptop
+over time. This graph depicted above show the slow death of my laptop
battery.</p>
<p>But why is this happening? Why are my laptop batteries always
to write a tool to calculate the derivative values of the battery
level, but suspect some interesting insights might be learned from
those.</p>
+
+<p>Update 2015-09-24: I got a tip to install the packages
+acpi-call-dkms and tlp (unfortunately missing in Debian stable)
+packages instead of the tp-smapi-dkms package I had tried to use
+initially, and use 'tlp setcharge 40 80' to change when charging start
+and stop. I've done so now, but expect my existing battery is toast
+and need to be replaced. The proposal is unfortunately Thinkpad
+specific.</p>
</description>
</item>
<item>
<title>Book cover for the Free Culture book finally done</title>
- <link>http://people.skolelinux.org/pere/blog/Book_cover_for_the_Free_Culture_book_finally_done.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Book_cover_for_the_Free_Culture_book_finally_done.html</guid>
+ <link>https://people.skolelinux.org/pere/blog/Book_cover_for_the_Free_Culture_book_finally_done.html</link>
+ <guid isPermaLink="true">https://people.skolelinux.org/pere/blog/Book_cover_for_the_Free_Culture_book_finally_done.html</guid>
<pubDate>Thu, 3 Sep 2015 21:00:00 +0200</pubDate>
<description><p>Creating a good looking book cover proved harder than I expected.
I wanted to create a cover looking similar to the original cover of