Free Knowledge Resources


Linux Manual Pages


Free Software * Books

Source Code

Free Media

Linux

powertop(8)


NAME

   powertop - a power consumption and power management diagnosis tool.

SYNOPSIS

   powertop [options]

DESCRIPTION

   powertop  is a program that helps to diagnose various issues with power
   consumption and power management.  It  also  has  an  interactive  mode
   allowing  one  to  experiment  with  various power management settings.
   When invoking powertop without arguments powertop starts in interactive
   mode.

OPTIONS

   --auto-tune
          Set   all   tunable   options  to  their  good  setting  without
          interaction.

   -c, --calibrate
          Runs powertop in calibration mode.   When  running  on  battery,
          powertop can track power consumption as well as system activity.
          When there are enough measurements, powertop can start to report
          power  estimates.   One can get more accurate estimates by using
          this option to enable a  calibration  cycle.   This  will  cycle
          through  various  display  levels  and USB device activities and
          workloads.

   -C, --csv[=filename]
          Generate a CSV report.  If a filename is not specified then  the
          default  name  powertop.csv is used.  The CSV report can be used
          for reporting and data analysis.

   --debug
          Run in debug mode.

   --extech=devnode
          Use the Extech Power Analyzer for measurements.  This allows one
          to  specify  the serial device node of the serial to USB adaptor
          connecting  to  the   Extech   Power   Analyzer,   for   example
          /dev/ttyUSB0.

   -r, --html[=filename]
          Generate  an  HTML  report.  If a filename is not specified then
          the default name powertop.html is used.  The HTML report can  be
          sent to others to help diagnose power issues.

   -i, --iteration[=iterations]
          Number of times to run each test.

   -q, --quiet
          Suppress stderr output.

   -t, --time[=seconds]
          Generate a report for a specified number of seconds.

   -w, --workload[=workload]
          Execute  workload  file as a part of calibration before making a
          report.

   -V, --version
          Print version information and exit.

   -h, --help
          Show the help message and exit.

COMMANDS

   In interactive mode, the following key bindings are available:

          Tab                    Show next tab
          BackTab                Show previous tab
          Right Arrow            Scroll to the right
          Left Arrow             Scroll to the left
          Up Arrow, PageUp       Scroll up or select previous item
          Down Arrow, PageDown   Scroll down or select next item
          Space, Return          Activate current item
          s                      Set refresh timeout
          r                      Refresh window
          q, Ctrl-C, Escape      Exit powertop

BUGS

   Send bug reports to powertop@lists.01.org

SEE ALSO

   The program is more fully described at https://01.org/powertop

AUTHOR

   powertop was written by Arjan van de Ven  arjan@linux.intel.com,  and
   is  currently maintained by Chris E Ferron chris.e.ferron@linux.intel.
   com.



Opportunity


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.



Free Software


Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.



Free Books


The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.



Education


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.


birds banner