Make Tech Easier» krunner

KDE Power Management 101

Tavis J. Hampton — Wed, 09 Jun 2010 12:00:05 +0000

While there are exceptions, power management is primarily the concern of laptop, netbook, and tablet users, and as the world becomes increasingly reliant on these mobile devices, getting good battery life and conserving energy are top priorities.

KDE’s power management is controlled by an application called PowerDevil. There are three ways to access and manage PowerDevil:

1.System Settings module
2.Plasma Battery Monitor widget
3.Krunner plugin

System Settings

The PowerDevil System Settings module is found under the “Advanced” tab in the “Advanced User Settings” section. Click on “Power Management” to start it.

There are three side tabs:

1. General Settings – Here you can configure global settings that will apply to all profiles, such as “lock screen on resume”. It also allows you to assign profiles to certain situations. For example, when your laptop or netbook is unplugged, the “Powersave” profile is assigned by default.

The last button sets notifications. For example, when the laptop is unplugged, a system tray notification will pop up.

The “Advanced Battery Settings” tab allows users to set custom battery power levels.

2. Edit Profiles – Each profile has a plethora of settings, allowing users full control over the system’s power management. Here are some key features:

Disable desktop effects, if active – This is commonly used for lower-power situations. KWin desktop effects will use more CPU and GPU power. By enabling this setting, KDE will temporarily disable effects until the power profile changes.

Action settings – Pressing the power button, closing the laptop lid, or pressing the suspend key all have actions assigned to them, and PowerDevil gives you the ability to change those actions or disable them completely.

Screen – Dimming or turning off the screen can save power and extend the life of the screen. In this tab, you can set the specific times for each state, as well as the default brightness level for the given profile.

CPU – With multi-core systems, you can disable one or more of the CPUs when a profile is activated. If you have CPU scaling enabled, you can also set the scaling policy to run the CPU at a slower speed when on battery power.

3. Capabilities – The capabilities tab is essentially an information center that provides you with valuable information about your mobile computer. It will tell you what power features and actions are enabled and available.

Plasma Widget

The batter monitor widget displays the percentage of battery power remaining and tells the user if the cord is plugged in or not. Left click on the battery icon to bring up a quick access panel. From there, you can change the brightness, power profile, enable suspend or hibernate, and access the previously-mentioned system settings module. Right clicking brings up configuration options for the module.

Krunner

Krunner is an advanced command and application launcher. With it, you can quickly access settings, enable power actions, or change the system state. You can access it by pressing Alt+F2 or right clicking on the desktop and clicking “Run Command”.

Screen Brightness: To change the brightness of the screen, type “Screen Brightness ##”, replacing ## with a percentage number. For example: Screen Brightness 65. If you type “screen brightness” with no number, it will give you general options like “dim screen by half” and “turn off screen”.

Power Profile: Simply type in “power profile”, and Krunner will give you a list of profile options.

Power Governor: If enabled, this allows you to set the CPU governor profile.

Suspend: Type “suspend” and then select “Suspend to Disk” or “Suspend to RAM”

Troubleshooting

Q. My suspend and/or brightness keys do not work
A. Make sure you have KHotkeys enabled in System Settings/Advanced/Service Manager. If it still does not work, you may need to consult your distribution’s documentation on hotkeys for your particular laptop.

Q. I have an Nvidia card, and the GPU does not run at full speed. Where do I configure that?
A. If you are using Nvidia’s proprietary drivers, configure it with nvidia-settings.

Q. Suspend does not work, works only once, or freezes/crashes the laptop.
A. Linux suspend support will vary depending on the device. Check your distribution’s help documentation or forums.

KDE PowerDevil makes power management easy and completely integrated with the KDE graphical interface. Because of this, users can create their own Krunner plugins or Plasma widgets to interact with it. As Linux becomes more popular, particularly on netbooks, PowerDevil should play an important role.

KDE Power Management 101 originally published on Make Tech Easier (RSS)
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10 Awesome Features of Krunner in KDE 4

Tavis J. Hampton — Mon, 29 Jun 2009 12:21:00 +0000

Many KDE 3 users depended on Krun, a simple yet effective application used to execute commands. Executed simply by pressing “Alt-F2″, it was much easier to start applications using it, rather than navigating through a launch menu or opening a terminal window. The only catch with Krun was that you had to know the exact name of the command you intended to launch. With the advent of KDE 4, that has all changed.

Krunner operates independently of the Plasma desktop system as a standalone application. It includes a ton of features that make it useful beyond simple command launching. It has retained many of the features present in KDE 3 and greatly expanded them. We would fail to do it justice if we did not give it a top ten list.

10. Calculator

Do you need to figure out how much money you have left for groceries after subscribing to three MMORPGs? Just press “Alt-F2″ or right click on the desktop and press “run command”. To use Krunner as a calculator, type the = sign and then enter the equation. For example, type “=890*12″, and it will output a calculator icon and the answer: “10680″. Simply select the answer to calculate the next equation with it. KDE 3 had a similar calculating feature that automatically opened Google’s calculator. With this you can calculate multiple times without leaving the Krunner window.

9. Spellchecker

If you are anything like me, you are obsessed with spelling things correctly and yet could not spell to save your life. If you happen to be typing a blog post in OpenOffice.org or using Firefox’s spellcheck feature, you will be safe. But if you are in the middle of one of those MMORPGs and need to spell “elemental” correctly, hop into windowed mode and press “Alt-F2″. Then type “spell:” followed by your best attempt at spelling the word you need. Krunner will offer suggestions.

8. Unit converter

Are you planning to visit any country outside of the U.S. and cannot understand why people “don’t speak American”? KDE will rescue you again. Open Krunner and enter a number and any unit you can imagine. By default, it will convert that unit to meters. Add “in” or “as” followed by another unit, and it will immediately output the conversion. For example, type “5 miles in cm” and it will output: “804672 centimeters”.

7. Contact finder

Whenever you need to shoot off a quick email, just type in the name of a person in your address book (You must use Kaddressbook for this work). Krunner will pull up any names close to what you type and display: “Mail to so-and-so”.

6. Website launcher

Krunner can launch any website you type in your default browser. It will also use konqueror shortcuts. For example, to search Google Images, enter: “images: pandas”. It will display its function before you press enter: “Search Google Image Search for pandas”. It can also launch bookmarks and browser history.

5. Location launch

Are you tired of navigating through file folders? Just type in the folder you want to reach in Krunner. If you want to open your Music folder, just type “Music”. It is really that simple.

4. Desktop search

You know you typed a paper two years ago on tectonic plate shifting, but you just cannot find it. If you are using Strigi, KDE’s desktop search system, Krunner can find it. Type in any search terms you want and let the desktop searching do the rest.

3. Task manager

A slimmed down version of ksysguard, KDE’s task manager is available as a component within Krunner. Users can access it by clicking on the second icon from the left in the Krunner window or by pressing Ctrl-Esc anywhere within KDE. It is quick and easy, allowing you to monitor CPU and Memory usage. You can also kill applications at will. Use with care.

2. Application search

Suppose you want to launch a card game but cannot remember the name. Just type in “card” into Krunner, and your card game applications will appear. You can also begin typing the name of an application, and Krunner will display all the applications that start with those letters while you are typing.

1. Command launcher

Even with all of the new features, nothing beats the original. Krunner is still a command launcher and still keeps a history of commands you have launched, which you can display either by beginning to retype them or opening the drop-down menu. Therefore, you only have to type “kdesudo kate /etc/X11/xorg.conf” once, and Krunner will remember it the next 20 times you want to tweak your X server.

Perhaps the greatest thing about Krunner is that it is extensible. Many of the plugins mentioned above were authored by users who were not on the original Krunner development team. Anyone can write a plugin, making the possibilities endless. Any plugins you do not like can be disabled, so KDE 3 purists can return it to command-launching-only status anytime they like. That is also useful on slower machines. With each release of KDE, however, Krunner will be even faster, with more awesome features to add the list.

*Note: These features are presented as they currently appear in KDE 4.3, scheduled to be released at the end of July 2009.

10 Awesome Features of Krunner in KDE 4 originally published on Make Tech Easier (RSS)
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