From d5133d07f6ad0aeef66dd8457bc7046249ffb638 Mon Sep 17 00:00:00 2001
From: Dubh Ad <DubhAd@users.noreply.github.com>
Date: Fri, 14 Jun 2019 09:05:10 +0100
Subject: [PATCH] Adding a big warning (#9614)

* Adding a big warning

Multiple people have independently identified `modemmanager` as the source of Z-Wave and Zigbee related issues, and confirmed that disabling it resolves those problems. Adding a great big warning here.

* Added some instructions
---
 source/hassio/installation.markdown | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/source/hassio/installation.markdown b/source/hassio/installation.markdown
index 112653f51bd..8c90ce1f509 100644
--- a/source/hassio/installation.markdown
+++ b/source/hassio/installation.markdown
@@ -115,6 +115,10 @@ The packages you need to have available on your system that will run Hass.io may
  - socat
  - software-properties-common
 
+<p class='note warning'>
+   The `modemmanager` package will interfere with any Z-Wave or Zigbee stick and should be removed or disabled. Failure to do so will result in random failures of those components. For example you can disable with `sudo systemctl disable ModemManager` and remove with `sudo apt-get purge modemmanager`
+</p>
+
 ### {% linkable_title Arch Linux %}
 
  - apparmor