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-rw-r--r--src/ib-brightness-control.c8
1 files changed, 7 insertions, 1 deletions
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);