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~/.config/pipewire/pipewire.conf.d/10-bt-headphones-default.conf
===========
context.properties = [
  default.configured.audio.sink = { "name": "bluez_output.AC_12_2F_24_80_86.1" }
]
===========
~/.config/pipewire/pipewire.conf.d/20-echo-cancel.conf 
===========
 context.modules = [
  {   name = libpipewire-module-echo-cancel

Waltibaba

# to install with full disk encryption and more than 1 partition, you need to either 
* enter your password for each encrypted partition (also your disk layout is transparent)
* install a helper to enter a single password multiple times
* put all the partitions into LVM and decrypt once (at the cost of more abstraction layers)

with EFI + GRUB + LVM on a big LUKS on /dev/sda, these are the steps:
1. partition with a small (~300MB ESP partition for EFI) as /dev/sda1, and a large LUKS partition as /dev/sda2
2. encrypt /dev/sda2
  `cryptsetup -v --type luks --iter-time 5000 --verify-passphrase luksFormat /dev/sda2`
  --iter-time increases iterations of pbkdf2, to increase security at the cost of time

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#!/bin/bash

echo "testing for sudo"
sudo date
if [ $? -ne 0 ]
then
    echo "failed sudo"
    return -1
fi

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#!/bin/bash
# put this in /usr/lib/systemd/system-sleep/
# don't forget to chmod +x it

case $1/$2 in
  pre/*)
    # echo "Going to $2..."
    /usr/bin/rmmod tpm
    /usr/bin/rmmod tpm_tis
    /usr/bin/rmmod tpm_tis_core

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/etc/pacman.d/hooks/backup-modules.hook
[Trigger]
Operation = Upgrade
Operation = Remove
Type = Package
Target = linux

[Action]
Depends = coreutils
Depends = bash

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enable it:
/etc/pulse/default.pa
=========
### Enable Echo/Noise-Cancelation
load-module module-echo-cancel source_name=echoCancel_source sink_name=echoCancel_sink aec_method=webrtc aec_args="analog_gain_control=0 digital_gain_control=1"
set-default-source echoCancel_source
set-default-sink echoCancel_sink


stop the echoey crackling (https://bbs.archlinux.org/viewtopic.php?id=116172) uncomment/edit these lines:

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#
# Automatically generated file; DO NOT EDIT.
# coreboot configuration
#

#
# General setup
#
CONFIG_LOCALVERSION=""
CONFIG_CBFS_PREFIX="fallback"

Waltibaba

[Unit]
Description="graphical application"
JobTimeoutSec=60
AssertPathExists=/home/USERNAME

[Service]
WorkingDirectory=/home/USERNAME
Environment=XAUTHORITY=/home/USERNAME/.Xauthority
Environment=DISPLAY=:0
Type=forking

Waltibaba

http://stackoverflow.com/questions/15291500/i-have-2-versions-of-python-installed-but-cmake-is-using-older-version-how-do

EITHER:
find_package( PythonLibs 2.7 REQUIRED ) # if it already has a find_package(PythonLibs)

OR:
needed to use  python2.7 to compile an older library, but cmake keeps picking up my python3.2 libraries (and executable).
First, I ran cmake with default options, then edited the CMakeCache.txt file which it generated. I did it this way primarily because I didn't know the proper -D... incantations to cause cmake to get the python library and include paths, etc right in the first place.
In my CmakeCache.txt, I found lines like this

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[Unit]
Description="Script actions description"
JobTimeoutSec=60
AssertPathExists=/path/to

[Service]
Type=simple #forking
ExecStart=/bin/bash /path/to/script.sh
Nice=0