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Easy instructions to get QEMU/KVM and virt-manager up and running on Arch

1. Make sure your cpu support kvm with below command:

    grep -E "(vmx|svm)" --color=always /proc/cpuinfo
   

2. Make sure BIOS have enable “Virtualization Technology”.

3. User access to /dev/kvm so add your account into kvm(78) group:

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Bluetooth Pairing one device on Dual Boot of Windows & Linux - Stop having to Pair Devices

You may have experienced when dual booting that you need to re-pair your bluetooth devices (ie., Headphones, mouse, keyboard, etc) this usually happens because you have already paired the device with another operating system using the same bluetooth adapter when dual booting (either Linux or Windows).

Some devices cannot handle multiple pairings associated with the same MAC address (ie., bluetooth adapter). As per suggested on the ArchWiki you can fix this by re-pairing the device each time, but there's actually another solution to not do so each time you choose to use your device on a different OS.

How can we accomplish this?

Easy, just pair the device on a OS and copy the bluetooth keys generated to the other OS so our device doesn't notice the difference.

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Ledger Nano S on Linux

Requirement:

• Ledger Nano
• Ledger HW1
• Ledger Nano S
• Ledger Blue
• Special Edition

You need to create a set of udev rules to allow access to the device on Linux. This can be done easily by running the following command:

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TP-Link Tapo C500 and Linux

Those are my notes about using the TP-Link Tapo C500 camera in my Linux environment.

More precisely, my Linux system are

• a Debian Testing desktop pc
• a few raspberry pi
• an Asustor NAS that is running a highly customized Linux

Tapo C500 technical summary

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     ~ # fan_control -?
     *** Fan Cobtrol Help Message ***
     fan_control b c: for NAS booting
     fan_control 0 d : [auto: low/medium/high/max] open debug msg
     fan_control 0 c : [auto: low/medium/high/max] close debug msg
     fan_control -L [value] : set Lower (THYST)
     fan_control -H [value] : set Upper(TOS)
     fan_control -g 0 : get current temperature
     fan_control -g 1 : get Lower temperature
     fan_control -g 2 : get Upper temperature

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Managing the gpg-agent

These are the standard commands:

gpgconf --list-dirs
gpgconf --kill gpg-agent
gpgconf --reload gpg-agent

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Installing Arch Linux ARM on a SD card for Raspberry Pi 0 W and loading wifi credentials for headless usage

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Advice

Before starting I highly suggest you create a new directory on your /home/user directory with an appropiate name for this task like rpi0alarm so you can change directory to /home/user/rpi0alarm and go through the following steps.

As I wrote this guide after collecting info from different sources (listed at the end) be mindful of your current path and the commands you are running to not damage your current installation on the host computer you are creating the SD Card.

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Use a different GTK2/3 theme for specific programs

Why would you want to specify a different theme for a program?

Most common scenario, you installed a program that looks horrible or unreadable on your current theme or variation of that theme (light, dark). There's a simple workaround for most programs to fix this problem.

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GTK 2

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Auto switch audio output when a new Bluetooth device connects

Depending on the distro or DE/WM you are running and which programs you are using to manage your audio you maybe run into the hassle of having to switch audio outputs each time you connect a bluetooth device (headset/speaker). You can in fact make pulseaudio to autoswitch when connection is established and not do it manually.

To accomplish this you just need to check a condition in the default.pa config file located in /etc/pulse/ directory on your install and add the following line load-module module-switch-on-connect like in the code snippet below:

...

### Automatically load driver modules for Bluetooth hardware

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Customize Chromebook Chrosh Shell Environment

Requirement: Chromebook, Common Sense, Commandline Ablity, 1 hour of time

Dear developers with a spare Chromebook lets inject a little personalization into your Crosh shell with custom fonts, the solarized theme, and extra secure shell options.

Also, keep in mind that the terms Chrosh, Chrosh Window, and Secure Shell all refer to various versions and extentions built around the ChromeOS terminal. Settings that affect the ChromeOS terminal are global.

Custom Fonts