Undervolting in Linux

For Linux there is no official program for undervolting, so enthusiasts using reverse engineering methods have found ways to change the voltage on Intel CPUs and have created their own utilities.

Source: https://miloserdov.org/?p=1932&PageSpeed=noscript

flashrom is a utility for identifying, reading, writing, verifying and erasing flash chips. It is designed to flash BIOS/EFI/coreboot/firmware/optionROM images on mainboards, network/graphics/storage controller cards, and various other programmer devices…

https://flashrom.org/Flashrom

Laptops

Why laptops are difficult

Laptops, notebooks and netbooks are difficult to support and we recommend to use the vendor flashing utility. The embedded controller (EC) in these machines often interacts badly with flashing, either by blocking all read/write access to the flash chip or by crashing (it may power off the machine or mess with the battery or cause system instability).

We have the goal of supporting every machine out there with flashrom, but ECs are particularly difficult besides blocking access and crashing:

Almost all ECs do not have public datasheets with programming information. Even if the programming information for an EC is public, the errata (often needed to use the EC for flashing) are not. Even if you have the datasheets with programming information (under NDA or by convincing the EC vendor to release them), the following problems…

https://flashrom.org/Laptops

https://stackoverflow.com/questions/2068344/how-do-i-get-a-youtube-video-thumbnail-from-the-youtube-api

My use case

Example:

[![](https://img.youtube.com/vi/9KJ7B-mYKYA/hqdefault.jpg)](https://www.youtube.com/watch?v=9KJ7B-mYKYA)


[![](http://img.youtube.com/vi/GEWnXmDfVZg/0.jpg)](http://www.youtube.com/watch?v=GEWnXmDfVZg "Unsocial media")

Further reading

https://stackoverflow.com/questions/14192709/is-it-possible-to-embed-youtube-vimeo-videos-in-markdown-using-a-c-sharp-markdow

Or via this much easier

http://www.get-youtube-thumbnail.com/

Log in as root

apt-get update && apt-get upgrade
apt-get install install git

git clone https://github.com/tuxedocomputers/tuxedo-keyboard.git

cd tuxedo-keyboard

git checkout release

Build the keyboard module as a kernel module:

make clean

sudo make dkmsinstall

Load the Module with modprobe:

sudo modprobe tuxedo_keyboard

Source: https://wiki.debian.org/InstallingDebianOn/TUXEDO/NOTEBOOKS/InfinityBookS14v5

The instructions given on the link above where for Debian 10 stable, but they also work on Debian 11 Bullseye

$ sudo apt install build-essential dkms linux-headers-amd64

$ cd Downloads/

$ wget https://download.virtualbox.org/virtualbox/6.1.22/virtualbox-6.1_6.1.22-144080~Debian~buster_amd64.deb

$ sudo chmod +x VirtualBox*.run

$ sudo ./VirtualBox*.run

$ vboxversion=$(wget -qO - https://download.virtualbox.org/virtualbox/LATEST.TXT)

$ wget "https://download.virtualbox.org/virtualbox/${vboxversion}/Oracle_VM_VirtualBox_Extension_Pack-${vboxversion}.vbox-extpack"

$ sudo vboxmanage extpack install --replace Oracle_VM_VirtualBox_Extension_Pack-${vboxversion}.vbox-extpack

$ sudo usermod -aG vboxusers $USERNAME

$ sudo reboot

Source:

All credits goes to @AmineTech https://www.youtube.com/channel/UCzL3-V01MvHCCskME3kSFMA

RAID

“RAID is a technology that is used to increase the performance and/or reliability of data storage. The abbreviation stands for either Redundant Array of Independent Drives or Redundant Array of Inexpensive Disks, which is older and less used. A RAID system consists of two or more drives working in parallel. These can be hard discs, but there is a trend to also use the technology for SSD (Solid State Drives). There are different RAID levels, each optimized for a specific situation. These are not standardized by an industry group or standardization committee. This explains why companies sometimes come up with their own unique numbers and implementations. This article covers the following RAID levels…”

https://www.prepressure.com/library/technology/raid

https://dev.to/ankit01oss/5-github-projects-to-make-you-a-better-devops-engineer-2fkl

Test question and Answers

“A great Admin doesn't need to know everything, but they should be able to come up with amazing solutions to impossible projects.” – cwheeler33 (ServerFault)

Source: https://github.com/trimstray/test-your-sysadmin-skills

This repository is a collection of various materials and tools that I use every day in my work. It contains a lot of useful information gathered in one piece. It is an invaluable source of knowledge for me that I often look back on.

https://github.com/trimstray/the-book-of-secret-knowledge

https://asciiflow.com/#/