On linux to convert from PDF to DJVU you can use pdf2djvu
sudo apt-get install pdf2djvu
then type
pdf2djvu -o output.djvu imput.pdf
useful options are
–monochrome
–lossy
-d NNN (where NNN is the desired page resolution)
To convert from DJVU to PDF you can use djview4
sudo apt-get install djview4
then in menu File -> Export -> as PDF

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Phoenix Technologies (produttore di tutti i BIOS dei computer HP Pavilion) sin dal 2003 parallelamente all’adozione delle specifiche TCG (TrustedComputing Group) ha sviluppato una propria piattaforma compatibile con le specifiche del Trusted Computing. Questa versione prende il nome di  “TrustedCore” ed è presente di default su tutti i portatili  HP Pavilion. (Immediatamente dopo l’accensione del [...]

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Phoenix Technologies (maker of all HP Pavilion’s BIOS) since 2003 along with adhering to TCG (TrustedComputing Group) specifications has developed its own version of Trusted Computing compliant platform. This version is called “TrustedCore” and is default on all the HP Pavilion product line. (Immediately after booting your laptop repeatedly press ESC key and you could [...]

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NOTE: This is a very interesting post by Rickard Holmberg I decided to mirror since the original is no longer online. It concerns hacking HP Pavilion BIOS in order to lower the CPU and GPU clocks and thus let the laptop fan make less noise. I found it a pretty interesting post, especially for those [...]

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You may wish to get rid of some templates in the contextual menu in KDE. The best practice would be removing the package installing those templates, however this is not always possible due to dependency problems.

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It’s been almost an year since there has been some turmoil over the failed HP Pavilion laptops due to the defective nVidia chipsets. These notably used to have a defective packaging that at temperatures over ~70°C turned unstable preventing the GPU from dissipating heat effectively and eventually letting it to burn. [nVidia source]

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NOTE: I have never personally had the chance (what a chance…) to try this recovery procedure, however I’ve found multiple references of people having successfully tested it, even on HP Pavilion laptops. If it doesn’t work for you please report it both here and to those who’ve had direct experience of it, I’m sorry I [...]

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I surfed into an interesting forum post concerning hacks and tweaks to HP Pavilion laptops graphic cards recently.
Basically the post describes the procedure to modify the nVidia video card core & memory frequencies through the tweak of the laptop BIOS files. It’s an interesting hack to get to know better your own computer.

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nUbuntu was born as a security testing xUbuntu flavor. However, due to the too big effort needed to keep a whole distribution up to date, despite it being based on the work by Ubuntu teams, it is seldom updated.
Much more frequently are updated its core components, through the nUbuntu PPA. Adding this PPA to your [...]

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Read the rest of enable nVidia CoolBits (frequency tuner)