Undervolt your notebook CPU for longer battery life
“Undervolting is the practice of reducing the supply voltage of a computer’s CPU. There are mainly three reasons to do so:

Reduce power consumption
Reduce heat generation
Reduce fan noise

Performance will not be affected as the energy you will save was just wasted (as heat) before.

Security is not affected, however [...]

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Less watts: environmentally friendly, longer lasting battery, less spending on energy bills.
Thanks to these tips you’ll be able to improve your Ubuntu GNU/Linux laptop lasting, maximize battery lasting and life and also our own planet Earth life expectancy!
QUESTA GUIDA È ANCHE DISPONIBILE IN LINGUA ITALIANA

Just for reference on my HP Pavilion dv6500 series laptop I [...]

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Meno watts: compatibilità ambientale, maggiore durata della batteria, minor costo sulle bollette della luce.
Grazie a questi suggeriemnti sarai in grado di migliorare la durata della batteria sul tuo portatile Ubuntu GNU/Linux HP Pavilion ed anche l’aspettativa di vita del nostro Pianeta Terra!
THIS TUTORIAL IS ALSO AVAILABLE IN ENGLISH LANGUAGE

Come riferimento sul mio portatile HP Pavilion [...]

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echo 1 > /proc/sys/vm/block_dump
enables you to see via dmesg and syslog which application is accessign the disk and for doing what
blktrace
from blktrace package (sudo apt-get install blktrace) is also useful since it prompts you with those applications that access your hd the most. Use it this way:
bltrace /dev/sda

addthis_url = ‘http%3A%2F%2Faldeby.org%2Fblog%2Findex.php%2Fanalyze-disk-usage.html’;
[...]

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using sysctl and sysfs to tweak /proc and /sys parameters can be useful in order to permanently set powertop suggestions or not to have to recompile the kernel for only one value change.
lm-profiler
helps disabling unneeded services
You can use sysctl to tweak the running kernel parameters (tweak /proc entries)
and /etc/sysctl.conf to apply these settings permanently
e.g. including [...]

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In order to enable CoolBits extension with accelerated 3D ‘nvidia’ nVidia drivers you have to edit file /etc/X11/xorg.conf
sudo gedit /etc/X11/xorg.conf
and in section
Section “Screen”
Identifier “Screen0″
…
add this string
Option “Coolbits” “1″
then save.
You will then [...]

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On December 20 nVidia released stable driver version 169.07 downloadable via official website or easier via the updated envy script written by Alberto Milone to which my thanks fly for having written such a handy tool (direct link to deb package here).
This new driver features some performance enhancements for GeForce 8 series, but above all [...]

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using laptop-mode in conjunction with other hard disk monitoring software needs some attention in order to minimize disk’s spin-ups.
hddtemp so far queries the hard disk for temperature status every 60 seconds, thus wakening it from standby status that often.
Unless a workaround is found it would be a wise thing to remove it.
smartmontools (smartd) queries the [...]

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As of 100.14.19 nVidia driver (nvidia-glx-new) has been introduced an experimental support for
ondemand vblank interrupts.
The X xorg.conf subsection for the video driver needs this line:
Option “OnDemandVBlankInterrupts” “true”
I just tested it and must say it is indeed effective! the 60 wakeups per second that wakened up my system before due to [...]

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