From 04d9fb8da6daf1d66db432c22b8aa02dad12741e Mon Sep 17 00:00:00 2001
From: Vincent Bernat <vincent@bernat.im>
Date: Wed, 16 Mar 2016 15:49:22 +0100
Subject: [PATCH] brightness: handle the case where xbacklight doesn't work

This happens with modesettings...
---
 lib/brightness.lua | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/brightness.lua b/lib/brightness.lua
index d990e10..f025574 100644
--- a/lib/brightness.lua
+++ b/lib/brightness.lua
@@ -5,6 +5,7 @@ local naughty      = require("naughty")
 local tonumber     = tonumber
 local string       = string
 local os           = os
+local dbg          = dbg
 
 -- A bit odd, but...
 require("lib/icons")
@@ -16,8 +17,7 @@ local nid = nil
 local function change(what)
    os.execute("xbacklight -" .. what)
    local out = awful.util.pread("xbacklight -get")
-   if not out then return end
-
+   if not out or out == "" then return end
    out = tonumber(out)
    local icon = icons.lookup({name = "display-brightness",
 			      type = "status"})