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2010年12月18日星期六

Using Powertop to Lower System Power Usage by adapterlist.com

adapterlist.com - Using Powertop to Lower System Power Usage

Ever wonder what’s sucking the life out of your Linux laptop’s battery or contributing to higher electric bills in the server room? Check out Powertop, a tool for profiling a system to see what is using the most power.
trees Using Powertop to Lower System Power Usage by adapterlist.com
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Powertop was developed a few years ago to help profile systems and see what could be done to make Linux better at power savings. It was aimed primarily at laptops, as many folks would install Linux on a laptop and then find out that battery performance was far worse under Linux than Windows.
You don’t even need to run Powertop to benefit from it. Some of the most common power-gulping culprits are listed on the LessWatts.org website. Many of these have been fixed in the upstream projects that caused unnecessary wakeups (like ntp waking up every second, or Pidgin checking every 5 seconds to check on idle time). Something as simple as a blinking cursor can cause a wake up every few seconds, and additional power consumption.
But you might want to get a look at what’s going on under your system’s hood specifically. Powertop should be packaged for all major Linux distros, though it might not be installed by default. After installing Powertop, start it up as root (or using sudo) by running powertop. Now you’ll see an output that’s very similar to top but showing the top causes for wakeups. It also displays the ACPI estimate for power usage; at the bottom of the output, it will show suggestions (if any) to improve power performance — or it will notify you of processes preventing the disk from going into powersave mode.
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Some of the problems uncovered by Powertop are going to be beyond your control. While Powertop gives several tips that you can follow, like tuning the kernel to reduce wakeups, sometimes it just reports that an application is doing something silly. However, unless you are going to re-write the application yourself, not much can be done about it. You can file a bug though, assuming it’s egregious yet sane enough to fix.
But Powertop will also provide suggestions on how to tune the kernel or make other changes that will provide better power performance. For example, Powertop suggests increasing the timer for writing to disk to decrease the number of wakeups.
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You might not get mad power gains from using Powertop, but you can get some useful tips and see what it is that keeps the kernel going even when you’re not doing anything on the computer. It’s also an interesting look at what’s going on behind the scenes, in terms of which applications are writing to disk and when (and to what files). In using Powertop over a period of time, I found that (as expected) USB devices are one of my top sources for power consumption, as well as Firefox — even when it’s just sitting in the background doing nothing. This information comes in handy at various times. For example, if you’re at a conference and trying to conserve battery power, you might want to not have Firefox running all the time.
Spend a few hours with Powertop and you’ll learn much more about what goes on behind the scenes. You might even be able to boost your battery life and be a little greener to boot!
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Read more:
Take a Pick from Many a Laptop Battery by adapterlist.com
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Source:

http://adapterlist.com/laptop-adapter-care/2010/12/using-powertop-to-lower-system-power-usage-by-adapterlist-com/

Dual touch screen Acer laptop arriving in December by goodlaptopbattery.com.au

goodlaptopbattery.com.au-Dual touch screen Acer laptop arriving in December

Debuted last month, Acer’s Iconia laptop, which features not one but two touch screens, has now been given a December 14th UK launch date.
motz peter a beautiful spot 2402802 Dual touch screen Acer laptop arriving in December by goodlaptopbattery.com.au
Enjoy It!
Dual touch screen laptop
With touch tablets, notably the iPad, taking the world by storm, Acer last month decided to unveil the dual screen Iconia notebook, which can only be described as a tablet and laptop hybrid. Obviously the Iconia’s most notable attribute is its two touch screens, both of which have 14 inch screen diagonals, HD 1366 x 768 resolutions and of course multi-touch capabilities. They’re even covered in gorilla glass to prevent scratches and make fingerprints easier to clean.
Virtual keyboard
As you can see from the photo below, just like a tablet, the Iconia does not have an actual physical keyboard, with the second touch screen doubling as the keypad. Though some might miss the feeling of actual keys whilst typing, the full sized QWERTY virtual keyboard does have a lot of benefits. For example, it can switch between different language keyboards on the fly, it offers predictive text for faster typing, and you can also instantly change it to handwriting mode for jotting down notes.
Impressive specs
Whilst the dual touch screen displays might garner the most attention, the other big feature with the Iconia is its performance specs, which are decidedly laptop like. In contrast to your average tablet, which typically sports a measly 1GHz CPU, the Acer laptop runs off the new Intel Core i5 processor. This CPU is in turn backed up by 4GB of RAM and a whopping 750GB hard drive (much more storage than either the iPad or Galaxy Tab). To top it off, the Iconia’s other specs aren’t too bad either and include an actual HDMI port, USB, WiFi and optional 3G.

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With the Acer Iconia as a touch driven device, the first question that comes to our minds is what OS will the touch laptop be running? Unfortunately, the answer is Windows 7. We say unfortunately, because Windows 7, despite being touch compatible, has yet to prove itself as a viable touch OS.
Decent apps?
Acer claim the Iconia will ship with a wealth of onboard touch-based apps, such as Acer’s own TouchPhoto, TouchMusic, as well as SocialJogger (lets you check Facebook, Flickr and YouTube), MyJournal and Scrapbook. These all look promising, but in our opinion Windows 7 is still way far behind iOS4 and Android when it comes to tablet optimised apps. Moreover, whilst some have criticised Android as not being optimised for tablets, we have know doubt that it eventually will be, whereas the same can definitely not be said for Windows 7.
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Coming soon … a green laptop that runs on water? by goodlaptopbattery.com.au

Source:

http://www.goodlaptopbattery.com.au/battery-news/2010/12/18/dual-touch-screen-acer-laptop-arriving-in-december-by-goodlaptopbattery-com-au/

2010年11月25日星期四

How to maximize your laptop battery life - laptop battery tips by quality battery shop: batteryfast.co.uk

increase laptop battery lifeMobile computing has got better with lighter components, better chips and faster processors. But the Achilles heel of a laptop has remained its battery. So here are we are going to look at ways to increase laptop battery life.

Modern graphic intensive operating systems and resource hungry applications are cutting down the life of your laptop’s battery every day. The average battery life per continuous use still stands at a maximum of three to four hours. So, a fast depleting battery could very swiftly put the crutches on your ‘mobile’ road trip.

Falling just short of carrying an extra pack of batteries in the back-pack, are several ways to keep the juice flowing through the batteries.

1. Ship shape with a defrag

Regular defragmentation helps to arrange data more efficiently thus making the hard drive work less to access the data. The quicker the moving hard drive works lesser is the load placed on the battery. Thus, your batter can last longer. The effect is minimal, but this efficiency goes hand in glove with hard drive maintenance.

2. Kill the resource gobblers

End the background processes that are not vital. Monitor the resource usage through a ‘Ctrl-Alt-Del’ which brings up the Windows Task Manager (in Windows). If you’re not on the internet, it is safe to shut down the immediate non-essential programs running in the taskbar like the antivirus and the firewall. Weed out unnecessary programs running as start-ups by launching the System Configuration Utility from Run – Msconfig – Tab: Startup. Uncheck the programs which you don’t want to launch and reboot the computer once.

3. Pause the scheduled tasks

It may be a defrag or a virus scan, but make sure it is scheduled for a time when you are near a power outlet. If not then nix them for the moment.

4. Unplug external devices

USB devices are the biggest drainers of battery power. Unplug all external devices like an external mouse, PC cards, Wi-Fi, external speakers, Bluetooth and even an attached iPod.

5. Empty the CD/DVD Drives

Even if you don’t intend to use it, don’t leave any CD/DVDs as leftovers in the drives. A spinning drive sucks battery power like a sponge.

6. Go local

Desist using the DVD/external drives while running on batteries. Shift the content to the hard drive or run using (free) virtual drives like Pismo File Mount or even Microsoft’s Virtual CD ROM Control Panel.

7. Lower the lights

The LCD screen of a laptop is another huge power sink. Calibrate the brightness to the lowest level you can tolerate using the Function key toggles or using the Display Settings applet in the Control Panel.

8. Kill the sounds

Mute the speakers and try avoiding the use of multimedia software to maximize the battery life. Installed sound schemes also drain a battery perceptibly.

9. Rid the screensaver

To maximize battery life by a little, switch off the screensaver.

10. Visit Power Options

Get familiar with power management through the ‘Power Options’ applet in the Control Panel. Both XP and Vista come with advanced power management features which shut off components like the monitor and/or the hard drive after specified intervals. This again depends on the chosen ‘Power Schemes’ (for XP) in the same applet. For instance in XP, ‘Max Battery’ under Power Schemes can be selected for maximum battery optimization.



Similar settings can be found under ‘Mobile PC’ in the Control Panel of Vista.


11. Turn off the looks

Today’s OS’s like Windows Vista come with features like ‘Aero Glass’ which are resource guzzlers. One can turn it off and go for the ‘Classic’ appearance which consumes less power. In Vista, click on Desktop – Preferences – View Colour – Appearance – Classic Appearance and Windows Basic graphical interface. In XP it’s – Display Properties – Theme – Windows Classic.

Linux and even Macintosh are better optimized for longer battery life.

12. Hibernate is better than Sleep

In the Stand By mode (or sleep mode), the computer turns of the hard drive and the display but memory remains active while the CPU slows down. This draws on the battery. In contrast, hibernation mode is better because the computer saves the current state and shuts itself down completely thus saving power.

13. Get the most…work on the least

Working on too many programs while on the battery is a sure fire power drainer. Keep use of graphic intensive applications to a minimum. Working on a spreadsheet consumes much less than playing your favourite game. To increase the life of the battery open just one or two programs concurrently.

14. Ram in more RAM

Adequate RAM reduces the load on Virtual memory which by default resides on the hard drive. Though every extra bit of RAM uses up more power, it increases overall savings by short cutting access to the power hungry hard drive.

15. Keep it clean

A laptop with blocked air vents will generate more heat thus reducing the life of the battery. Clean the air vents regularly to keep operating temperatures low. Allow for open space around the vents for air to circulate freely. Keep the area around the laptop clean to avoid entry of dust.

16. Temperature is a silent killer

Undue heat kills off a battery slowly but surely. Avoid leaving the laptop under direct sunlight or inside a closed car.

17. Avoid the memory effect

A problem more for the older Ni-MH batteries than for Li-Ion batteries on which most modern laptops run. Memory effect relates to the loss of battery charge when they are repeatedly recharged after being only partially discharged. It can be prevented by discharging the battery fully and then completely recharging it. Li-Ion batteries on the other hand have no problems with partial discharges and re-charges and complete discharge is never recommended for this type.

18. Update software and drivers

This sounds a bit incongruous but then newer drivers and software are often designed to be more efficient (and hopefully less resource hungry).

19. Use the right adapter

Ensure that the adapter you use to charge the laptop battery is an original one or one with the correct specifications. A mismatch in the wattage could cause an overload thus damaging the laptop and the battery.

20. Pack it up

If you don’t plan to use the laptop on batteries for quite some time, ensure that the charge is nearly 40 percent – remove the batteries and store it in a cool place.

A typical lithium ion battery has an overall average life of 2-3 years. With some care and caution, its mortality can be delayed.

Have you found your own way to increase battery life of your laptop? Share the ‘life giving’ tips with us in the comments.

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