Re: Why does the laptop battery last longer with Windows than with Debian?
On Wed, 6 May 2009 13:01:59 + Tzafrir Cohen wrote: > On Sat, May 02, 2009 at 03:45:17PM +0200, Kaixi Luo wrote: > > Hello, > > I'm a new Linux user (currently using Debian 5 testing) and I've noticed > > that the battery of my laptop used to last much longer with Windows Vista (4 > > hours) than with Debian (2.5 hours). How's that possible?I mean, Debian > > uses much less RAM (250 MB) than Vista (1 GB). > > Speculation: > > Less memory may mean more disk activity as you need more swapping and I think he meant that debian uses less memory, not has less memory. > have less memory to cache access to the disk. More disk activity > probably increases the power consumption (if the disk can't rest). > -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
Re: Why does the laptop battery last longer with Windows than with Debian?
...sorry: On Th(...) > > >> Less memory may mean more disk activity as you need more swapping and >> have less memory to cache access to the disk. More disk activity >> probably increases the power consumption (if the disk can't rest). >> >> -- >> > So can you put SWAP in a ram file ??? >
Re: Why does the laptop battery last longer with Windows than with Debian?
On Wed, May 6, 2009 at 15:01, Tzafrir Cohen wrote: > On Sat, May 02, 2009 at 03:45:17PM +0200, Kaixi Luo wrote: > > Hello, > > I'm a new Linux user (currently using Debian 5 testing) and I've noticed > > that the battery of my laptop used to last much longer with Windows Vista > (4 > > hours) than with Debian (2.5 hours). How's that possible?I mean, Debian > > uses much less RAM (250 MB) than Vista (1 GB). > > Speculation: > > Less memory may mean more disk activity as you need more swapping and > have less memory to cache access to the disk. More disk activity > probably increases the power consumption (if the disk can't rest). > > -- > So can you put SWAP in a ram file
Re: Why does the laptop battery last longer with Windows than with Debian?
On Sat, May 02, 2009 at 03:45:17PM +0200, Kaixi Luo wrote: > Hello, > I'm a new Linux user (currently using Debian 5 testing) and I've noticed > that the battery of my laptop used to last much longer with Windows Vista (4 > hours) than with Debian (2.5 hours). How's that possible?I mean, Debian > uses much less RAM (250 MB) than Vista (1 GB). Speculation: Less memory may mean more disk activity as you need more swapping and have less memory to cache access to the disk. More disk activity probably increases the power consumption (if the disk can't rest). -- Tzafrir Cohen | tzaf...@jabber.org | VIM is http://tzafrir.org.il || a Mutt's tzaf...@cohens.org.il || best ICQ# 16849754 || friend -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
Re: Why does the laptop battery last longer with Windows than with Debian?
Thank you all for the helpful suggestions. I'll take a look at the links you've provided. :) Kaixi
Re: Why does the laptop battery last longer with Windows than with Debian?
Some useful readings on the topic: How to reduce power consumption - ThinkWiki http://www.thinkwiki.org/wiki/How_to_reduce_power_consumption HowTo/CpuFrequencyScaling - Debian Wiki http://wiki.debian.org/HowTo/CpuFrequencyScaling Good power management practices http://www.codon.org.uk/~mjg59/power/good_practices.html -- Regards, Jörg-Volker. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
Re: Why does the laptop battery last longer with Windows than with Debian?
On Sat, 2 May 2009 15:45:17 +0200 Kaixi Luo wrote: > Hello, > I'm a new Linux user (currently using Debian 5 testing) and I've noticed > that the battery of my laptop used to last much longer with Windows Vista (4 > hours) than with Debian (2.5 hours). How's that possible?I mean, Debian > uses much less RAM (250 MB) than Vista (1 GB). > > Also, is there anything I can do to improve my laptop battery life? > > Thanks, > > Kaixi Some things you can improve on, such as installing laptopmode (and possibly configuring it more or less aggresively) and using gnome-power-manager of similar to automatically control screen brightness when disconnected and possibly cpu throttling. Other things are currently hard to control and appart for some tweaks that are mostly proof of concept at the moment and will require waiting. These include power saving on the GPU (graphics card) which needs support from the driver writers, mostly nvidia/ati/intel. Some are better than others. Another issue is turning off hardware such as wireless antena, bluetooth, usb, sata power saving, etc. Some of this you can do manually either by tweaking laptop mode, or try running powertop in a console and see what it sugests. One of the main things is not controllable yet under linux and that is turning off pci power. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
Re: Why does the laptop battery last longer with Windows than with Debian?
On Sat, May 2, 2009 at 8:45 AM, Kaixi Luo wrote: > Hello, > I'm a new Linux user (currently using Debian 5 testing) and I've noticed > that the battery of my laptop used to last much longer with Windows Vista (4 > hours) than with Debian (2.5 hours). How's that possible?I mean, Debian > uses much less RAM (250 MB) than Vista (1 GB). > > Also, is there anything I can do to improve my laptop battery life? > You may consider doing the following: As a normal user, run the command "tasksel --list-tasks" and ensure that "laptop" has an "i" in the first column (as opposed to a "u"). If it has a "u" then run "tasksel --install-task laptop" as root. Installing the laptop task will install the following packages: acpi-support hibernate acpi powertop apmd radeontool anacron wireless-tools cpufrequtils nvclock wpasupplicant vbetool acpid pcmciautils toshset bluetooth avahi-autoipd This will set up various laptop friendly utilities including advanced power management support. You can research what each package on this list does, of course, and pick and choose them on your own individually. Good luck! -- Chris
Re: Why does the laptop battery last longer with Windows than with Debian?
On Sat, 02 May 2009 15:45:17 +0200, Kaixi Luo wrote: > the battery of my laptop used to last much longer with Windows Vista (4 > hours) than with Debian (2.5 hours). How's that possible? I bet that your Debian's power saving is not enabled by default. You've got to do some preliminary readings on that. E.g., http://xpt.sourceforge.net/techdocs/nix/sysmng/sm03-EnergySaving/ would be a good starting point. -- Tong (remove underscore(s) to reply) http://xpt.sourceforge.net/techdocs/ http://xpt.sourceforge.net/tools/ -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
Re: Why does the laptop battery last longer with Windows than with Debian?
That's really weird... I suggest you post your laptop's maker/model and whether you installed any specific packages or just chose "desktop" when installing. Maybe some program's doing a lot of I/O or something. Maybe thi'll help you tweak your system: http://wiki.debian.org/InstallingDebianOn HTH, Nuno Magalhães -- () ascii ribbon campaign - against html e-mail /\ ascii-rubanda kampajno - kontraŭ html-a retpoŝto -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
