Test Setup

As stated, we are testing four different operating systems. In order to keep the number of benchmarks manageable, we are focusing on two primary battery life scenarios. Our first test is an Internet web-browsing scenario. We configure the chosen browser to load three websites that contain Flash content every 60 seconds. When the battery level goes critical (usually 1%, although Windows 7 doesn't let us set this lower than 3%) the system shuts down. The second test is DVD playback battery life, again with the system set to run until the battery level is critical. The various operating systems don't necessarily give you the same level of control over power saving features, so we tested a couple scenarios on each Windows OS.

Windows XP

Windows XP gives you the least control over power saving features. We test two scenarios, one using the Portable/Laptop profile and the other using the Max Battery profile. We don't have specific details on what these settings mean in terms of maximum CPU performance, but it's clear that they do affect performance. They also impact battery life, and most people only want enough performance when running on battery life for their system to work properly. We did not experience any difficulties watching DVDs or surfing the Internet, although more CPU intensive tasks may have problems when using the Max Battery profile. On the Portable profile, the HDD is set to power down after five minutes, while the Max Battery profile has it set to power down after three minutes. We also measure LCD brightness with a colorimeter and set it as close to 100 nits as possible.

Windows Vista/7

Similar to Windows XP, we test two different power profiles in Windows Vista and 7: Balanced and Power Saver. These profiles correspond roughly to the same settings as the Windows XP profiles, but this time we have more control over the various details. For Windows Vista and 7, we use the following settings under Balanced.

The hard drive is set to power off after five minutes. The wireless adapter is set to medium power saving, hybrid sleep is enabled, and USB selective suspend is enabled. PCI-E link state power management is set to maximum power saving. The minimum processor state is set to 5% and the maximum processor state is 100%; we don't know how this specifically affects CPU clock speeds, and if you want to run a similar test make sure your notebook manufacturer doesn't specify different values. Search and indexing is set to power saver and adaptive display is disabled. Again, we calibrate the LCD to run at 100 nits, which is 35% brightness for these two laptops (three steps above minimum brightness).

The Power Saver profile uses the same settings in most areas, but we set the hard drive to power down after three minutes, the wireless adapter is at maximum power saving, and the maximum processor state is 50%. Windows 7 does include a few other areas that you can tweak, but most of these relate to LCD dimming in order to conserve power. This is not to say that Vista and Windows 7 are the same, because as we will see in the results there are some definite differences.

Ubuntu 9.0.4 (Jaunty)

There aren't a lot of power saving features available for tweaking within Linux - at least not that I could find. We configured the LCD to never shut off (just like on Windows), and set the system to shut down at 3% battery - the minimum we could specify. We also disabled LCD dimming. Honestly, I don't know nearly as much about Linux as Windows, but I did my best to get Linux installed properly on the two notebooks. As anyone who has used Linux before can tell you, getting driver support is sometimes a real pain in the rear.

Generally speaking, both systems also felt far more sluggish running Linux, especially for typical web browsing. We used Firefox 3.0 initially and then updated to 3.5 - not as easy as I would like under Ubuntu, and I have no idea why the latest build is called Shiretoko in some places and Firefox 3.5 in others. Whatever. Both versions of Firefox felt incredibly slow, but that was with Flash enabled. With the FlashBlock add-on, Internet performance was significantly better, but that isn't a fair comparison to the Windows browser tests. As a point of reference, we ran the same test under Windows Vista and achieved significantly better battery life. We will get to those results in a moment.

Our issues with configuring Ubuntu don't end with the browser, however. On the Intel-based NV58, we could not get LCD brightness to function properly. The result is that the LCD ran at maximum brightness during our tests, which obviously results in lower battery life. We tried to find an updated driver for the Intel GMA 4500MHD graphics, but so far we have been unsuccessful in addressing this issue. The AMD-based NV52 wasn't any better, but for different reasons. We could find updated drivers from ATI, but after repeated attempts we never did get them to function properly. We were left with running the proprietary fglxr 8.600 driver, and while it worked fine in general we had problems with DVD playback. VLC repeatedly crashed during our benchmarks, sometimes after a few minutes, sometimes after 50 minutes. Eventually, we decided to uninstall the proprietary ATI driver and test out the open-source MESA driver. Surprisingly, the open-source driver actually provided a better experience, although we aren't looking at 3D performance where ATI's fglxr driver likely has an advantage.

The short story is that while everything eventually worked out okay on the NV52, the number of headaches we encountered trying to get everything working properly under Ubuntu is more than a little frustrating. You get a sense of accomplishment once everything is working, or at least I did, but that's not something most people are interested in doing. Most people view computers as a tool and they wanted to "just work"; they don't want to scour the Internet looking for instructions on how to manually install the latest drivers/application/whatever. If you're Interested in a more detailed look at Linux, we suggest you read our Ubuntu 8.04 Article. The only area of Linux that we're testing today is battery life.

Index Gateway NV52 (AMD) - Battery Life


View All Comments

  • JarredWalton - Monday, September 21, 2009 - link

    Links please? I'm not a Linux guru by any stretch of the imagination, so if there's a "better" Linux option out there for testing I'm willing to give it a look. Ideally, I need something similar for the AMD platform. Reply
  • prince34 - Monday, September 21, 2009 - link

    You could always look a UNR(Ubuntu Netbook Remix) as a netbook distro. It's what I use on mine. I've done some comparisons to XP on it, and it seems to follow the trends you are seeing, but not with as much disparity.

  • smitty3268 - Monday, September 21, 2009 - link

    I'm not sure Moblin is really a "mainstream" linux option at this point, it's more of an Intel "look at what we can do on netbooks" research project. It does supposedly have 5 second boot times. I suspect your tests here are almost completely dependent on the browser and Flash anyway, and the video drivers. All areas that Linux does not excel at - battery and performance testing of Linux + Apache or file serving would no doubt be much better.

    http://moblin.org/downloads">http://moblin.org/downloads, if you really want to try it.
  • smitty3268 - Monday, September 21, 2009 - link

    Or the LiveCD version: http://moblin.org/documentation/test-drive-moblin">http://moblin.org/documentation/test-drive-moblin Reply
  • smitty3268 - Monday, September 21, 2009 - link

    Firefox for Linux is well known to be terribly slow and unoptimized compared to the Windows version. It would be interesting to see the battery results from running the Windows version through WINE on Ubuntu, just to see how that compares - I know it blows the Linux native version away as far as javascript performance is concerned, and I'm sure Flash is the same. You could also try Chrome, since I've heard it works quite fast, even though it's still in beta. Reply
  • Chlorus - Monday, September 21, 2009 - link

    But how could that happen? I thought Linux was the most awesome OS ever? All the people on slashdot said so! Are you saying they lied? M$ SHILL!!! Reply
  • smitty3268 - Tuesday, September 22, 2009 - link

    If you read what I was saying, it doesn't have anything to do with linux, it's a Firefox problem. They've got performance bug reports that say, "fixed, for windows. we could do this for linux but not worth the effort." They don't even enable profiled compilation, which is good for a 10-15% boost on windows. Reply
  • smitty3268 - Monday, September 21, 2009 - link

    Also, Ubuntu 9.04 (and other distros released last spring) had a terrible, terrible regression with Intel video driver performance. I'm not sure how much that really affects battery life, but it definitely could. Something to keep in mind, anyway, as you compare the differences between the two laptops. Reply
  • andrewaggb - Tuesday, September 22, 2009 - link

    It's true about the intel driver, but let's be honest, if it wasn't the graphics driver it'd be pulse audio, or using 64 bit instead of 32 bit firefox, ext4 whatever... Seems linux get's alot of excuses for it's problems.

    I'm pretty tired of ubuntu and fedora. Releasing half-finished, barely tested, OS's to the masses is not doing linux a favour, but as the answer to everything is it's fixed in svn... you're kinda stuck.
  • JarredWalton - Monday, September 21, 2009 - link

    I followed a guide on fixing Intel GPU performance in Ubuntu... I don't know if it really worked or not, but here's the reference:

    http://ubuntuforums.org/showthread.php?t=1130582">Jaunty with Intel Performance Guide. I stayed with the default kernel and the "Safe" configuration, which may be partly to blame for suboptimal results. Then again, the ATI platform fared worse under Jaunty.

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