{"id":1361,"date":"2005-08-14T17:55:16","date_gmt":"2005-08-14T15:55:16","guid":{"rendered":"http:\/\/vizZzion.org\/blog\/2005\/08\/kde-and-powermanagement\/"},"modified":"2005-08-14T17:55:16","modified_gmt":"2005-08-14T15:55:16","slug":"kde-and-powermanagement","status":"publish","type":"post","link":"https:\/\/vizZzion.org\/blog\/2005\/08\/kde-and-powermanagement\/","title":{"rendered":"kde and powermanagement."},"content":{"rendered":"<p><a href=\"http:\/\/vizzzion.org\/images\/blog\/dpmstab.png\" title=\"guidance's DPMS settings\"><img decoding=\"async\" src=\"http:\/\/vizzzion.org\/images\/blog\/dpmstab-thumb.png\" alt=\"guidance's DPMS settings\" title=\"guidance's DPMS settings\" align=\"right\" class=\"showonplanet\" \/><\/a><br \/>\n    One of my special interests is power management (PM).<\/p>\n<p>    While discussing if a display powermanagement option really should be in <a\nhref=\"http:\/\/www.simonzone.com\/software\/guidance\/\">guidance<\/a>&#8216;s displayconfig, I had a look where<br \/>\nPM-related options are living in kcontrol at the moment.<br \/>It was quite a shocking experience.<\/p>\n<p>    Assuming I want to optimize my laptop for battery lifetime, where are the places I have to go in<br \/>\nkcontrol, what assumption do I have to understand? Let&#8217;s have a look.\n  <\/p>\n<ul>\n<li>display power management comes to my mind, go to <em>Peripherals -> Display -> Power<br \/>\nControl<\/em><\/li>\n<li>Most WiFi card drivers offer a powe saving mode, go to <em>Internet &#038; Network -><br \/>\nWireless Network<\/em><\/li>\n<li><em>Power Control -> Laptop Battery<\/em> offers actions for events when battery is<br \/>\nrunning out and also some ACPI controls which make suspend modes and CPU power saving modes<br \/>\navailable &#8211; if setup correctly, also there&#8217;s a battery monitor<\/li>\n<li>My installation also has modules for IBM Thinkpad laptops (mostly for buttons \/ ACPI<br \/>\nevents) and a Sony VAIO module which aims to make the battery status of two batteries available (I<br \/>\nhave neither of those models, so these modules are of no use for me.)<\/li>\n<\/ul>\n<p>\n    I think the most easy thing for the novice user with respect to getting the laptop draining less<br \/>\npower is getting hopelessly lost.<\/p>\n<p>    The solution to this problem, however, is not trivial. Power management is related to a lot of<br \/>\ndifferent areas, suspend modes such as suspend-to-ram, suspend-to-disk, power management of<br \/>\ndifferent devices such as wireless adapters and the display play a role, but there&#8217;s obviously more<br \/>\nto it. I encountered that when designing the display powermanagement tab for guidance&#8217;s<br \/>\ndisplayconfig. It seems related to a screensaver (although a screensaver is no more than some eye<br \/>\ncandy toy on more recent hardware), but DPMS is some sort of extreme screensaver. Then there&#8217;s CPU<br \/>\nstates (C1 through C4 on some systems, although that&#8217;s really nothing the user should ever<br \/>\nnotice).<\/p>\n<p>    The big question is: <strong>How can power management be handled in a sensible way?<\/strong><br \/>\nThat is without having duplicate configuration options.<br \/>The approach I&#8217;ve taken now in guidance<br \/>\nis offering a DPMS tab, mostly for practical reasons, with a button to configure the screensaver<br \/>\nwhich just starts the screensaver configuration module. I&#8217;m not sure if we&#8217;re going to keep it this<br \/>\nway, though.<\/p>\n<p>    If you&#8217;re also interested in this area, please drop me an e-mail at sebas@kde.nl. Maybe this<br \/>\ntopic can also have profit by some discussion at <a href=\"http:\/\/conference2005.kde.org\/\">aKademy<br \/>\n2005<\/a>, which I&#8217;m going to attend.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>One of my special interests is power management (PM). While discussing if a display powermanagement option really should be in guidance&#8216;s displayconfig, I had a look where PM-related options are living in kcontrol at the moment.It was quite a shocking experience. Assuming I want to optimize my laptop for battery lifetime, where are the places&hellip; <a class=\"more-link\" href=\"https:\/\/vizZzion.org\/blog\/2005\/08\/kde-and-powermanagement\/\">Continue reading <span class=\"screen-reader-text\">kde and powermanagement.<\/span> <span class=\"meta-nav\" aria-hidden=\"true\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29],"tags":[],"class_list":["post-1361","post","type-post","status-publish","format-standard","hentry","category-kde"],"_links":{"self":[{"href":"https:\/\/vizZzion.org\/blog\/wp-json\/wp\/v2\/posts\/1361","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vizZzion.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vizZzion.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vizZzion.org\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vizZzion.org\/blog\/wp-json\/wp\/v2\/comments?post=1361"}],"version-history":[{"count":0,"href":"https:\/\/vizZzion.org\/blog\/wp-json\/wp\/v2\/posts\/1361\/revisions"}],"wp:attachment":[{"href":"https:\/\/vizZzion.org\/blog\/wp-json\/wp\/v2\/media?parent=1361"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vizZzion.org\/blog\/wp-json\/wp\/v2\/categories?post=1361"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vizZzion.org\/blog\/wp-json\/wp\/v2\/tags?post=1361"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}