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Taken from Raspberry Pi 2 User Guide by Vilros

If you connect your Pi to a television using an HDMI cable, Raspbian automatically selects a screen size that it decides will be the best for your setup. However, this is not always the highest resolution.

The configuration setting that controls how Raspbian selects the screen size is in the file /boot/config.txt and you can adjust this setting with a text editor:

1. On the Application Launcher, click LXTerminal.

2. Type the following command and then press Enter:

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       NoMethodError: undefined method `trace_id' for Marginalia::Comment:Module
       /app/vendor/bundle/ruby/2.5.0/gems/marginalia-1.10.1/lib/marginalia/comment.rb:25:in `block in construct_comment'
       /app/vendor/bundle/ruby/2.5.0/gems/marginalia-1.10.1/lib/marginalia/comment.rb:24:in `each'
       /app/vendor/bundle/ruby/2.5.0/gems/marginalia-1.10.1/lib/marginalia/comment.rb:24:in `construct_comment'
       /app/vendor/bundle/ruby/2.5.0/gems/marginalia-1.10.1/lib/marginalia.rb:50:in `annotate_sql'
       /app/vendor/bundle/ruby/2.5.0/gems/marginalia-1.10.1/lib/marginalia.rb:71:in `execute_with_marginalia'
       /app/vendor/bundle/ruby/2.5.0/gems/activerecord-4.2.11.19/lib/active_record/connection_adapters/postgresql/schema_statements.rb:286:in `client_min_messages='
       /app/vendor/bundle/ruby/2.5.0/gems/activerecord-4.2.11.19/lib/active_record/connection_adapters/postgresql_adapter.rb:673:in `configure_connection'
       /app/vendor/bundle/ruby/2.5.0/gems/activerecord-4.2.11.19/lib/active_record

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/* Include the HCWS2812 library */
#include "HCWS2812.h"

/* Create an instance of the library */
HCWS2812 HCWS2812;

void setup() 
{
  /* Set the R,G,B background colours to zero */ 
  HCWS2812.SetBG(55, 55, 55);

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1. Download NOOBS

2. Use ApplePi-Baker to Prepare SD card for NOOBS.

3. Copy the extracted contents of NOOBS download onto SD card.

4. Follow the instructions for an automatic install.

5. Insert the SD card into the Pi, attach an ethernet cable, plug it in.

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#!/usr/bin/env ruby
$:.unshift(File.expand_path('../../lib', __FILE__))
require 'ws2812'

def display(array, colours)
  $hat.clear false
  array.each_with_index do |row, x|
    row.each_with_index do |value, y|
      $hat[x, y] = colours[value]
    end

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#!/usr/bin/env ruby
$:.unshift(File.expand_path('../../lib', __FILE__))
require 'ws2812'

# Init
$hat = Ws2812::UnicornHAT.new
$hat.rotation = 90
$hat.clear

l = Ws2812::Color.new(220, 220, 220)

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#!/bin/bash

# -----------------------------------------------------------------------
# Installs Ruby 2.3 using rbenv/ruby-build on the Raspberry Pi (Raspbian)
#
# Run from the web:
#   bash <(curl -s raw_script_url_here)
# -----------------------------------------------------------------------

# Set up variables

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RSpec.configure do |config|

...

  # changes the config on the backtrace display to ignore the /gems/ folder
  config.backtrace_exclusion_patterns.push(/gems/)

...

end

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• git checkout master
• git pull
• git checkout <branch>
• git rebase master
• git push --force
• git checkout master
• git merge --no-ff

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[alias]
        addr = add -A
        ci = commit
        co = checkout
        lg = log --graph --decorate --branches --abbrev-commit
        st = status -sb
        ds = diff -- staged
        graph = log --graph --pretty=format':%C(yellow)%h%Cblue%d%Creset %s %C(white) %an, %ar%Creset'
[color]
        ui = true