From 1b5643103532cd11cbd4432e9c534871c3a34fe9 Mon Sep 17 00:00:00 2001
From: Charles Kerr <charles.kerr@canonical.com>
Date: Mon, 19 Aug 2013 22:41:09 -0500
Subject: in ib_brightness_control_set_value(), log the strerror when write()
 fails.

---
 src/ib-brightness-control.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/ib-brightness-control.c b/src/ib-brightness-control.c
index cf1e5ad..2b9b79d 100644
--- a/src/ib-brightness-control.c
+++ b/src/ib-brightness-control.c
@@ -18,6 +18,8 @@
  */
 
 #include <gudev/gudev.h>
+
+#include <errno.h>
 #include <stdlib.h>
 #include <fcntl.h>
 #include <string.h>
@@ -75,6 +77,7 @@ ib_brightness_control_set_value (IbBrightnessControl* self, gint value)
     gchar *filename;
     gchar *svalue;
     gint length;
+    gint err;
 
     if (self->path == NULL)
       return;
@@ -90,9 +93,12 @@ ib_brightness_control_set_value (IbBrightnessControl* self, gint value)
     svalue = g_strdup_printf ("%i", value);
     length = strlen (svalue);
 
+    err = errno;
+    errno = 0;
     if (write (fd, svalue, length) != length) {
-        g_warning ("Fail to write brightness information.");
+        g_warning ("Fail to write brightness information: %s", g_strerror(errno));
     }
+    errno = err;
 
     close (fd);
     g_free (svalue);
-- 
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