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a symptom

I am the Japanese and not good at writng English. I'm sorry to my language ability for you.
I sometimes get the following error when logging out of Xorg. It's a little different to [xf86-video-intel] flip_done timed out, but it's similar.
[drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] ERROR [CRTC:37:pipe A] flip_done timed out.

Using the video=SVIDEO-1:d kernel parameter doesn't work for me.
I'm running Arch Linux (4.17.2-1) on my laptop ThinkPad X220 with xf86-video-intel (my CPU is an i5-2540M).

$ dmesg
$ hwinfo

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Thinkpad x220 general

Power settings (powertop+tlp)

powertop setup

1. Install powertop

sudo pacman -S powertop

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#!/bin/bash

declare -a COLORS
j=0
# Default colors are light for dark terminals.
# Use '-l' option for normal (darker) text.
# Red, green, yellow, blue, magenta, cyan.
for i in {91..96}; do COLORS[$j]=$i; let "j++"; done

usage() {

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sudo find /private/var/folders/ -name com.apple.dock.iconcache -exec rm {} \;

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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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# Screenshot Menu
set $maimode "[S]crot . scrot&[U]pload . scrot2[C]lipboard . scrot[A]rea"
bindsym $mod+Shift+Print      mode $maimode
mode $maimode {
    bindsym s         exec --no-startup-id "mkdir -p ~/Pictures/Screenshots && maim -m 10 ~/Pictures/Screenshots/scrot-$(date +%Y-%m-%d_%H-%M-%S).png", mode "default"
    bindsym u         exec --no-startup-id "mkdir -p ~/Pictures/Screenshots && maim -m 10 -s ~/Pictures/Screenshots/upload.png && imgur ~/Pictures/Screenshots/upload.png", mode "default"
    bindsym c         exec --no-startup-id "mkdir -p ~/Pictures/Screenshots && maim -m 10 -s | xclip -selection clipboard -t", mode "default"
    bindsym a         exec --no-startup-id "mkdir -p ~/Pictures/Screenshots && maim | maim -m 10 -s ~/Pictures/Screenshots/cropped-$(date +%Y-%m-%d_%H-%M-%S).png", mode "default"
    bindsym Return    mode "default"
    bindsym Escape    mode "default"

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#Prefix Key
set -g prefix ^a
set -g status-keys vi
setw -g mode-keys vi
# setw -g mode-mouse on

unbind c
unbind i
unbind l
unbind s

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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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#
# Sets Prezto options.
#
# Authors:
#   Sorin Ionescu <sorin.ionescu@gmail.com>
#

#
# General
#

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#!/bin/bash

moonphase(){
  local lp=2551443
  local now=$(date -u +"%s")
  local newmoon=592500
  local phase=$((($now - $newmoon) % $lp))
  local phase_number=$((((phase / 86400) + 1)*100000))

  # Multiply by 100000 so we can do integer comparison.  Go Bash!