[gnome-power-manager] Only setup the blanking timeout when a timeout is set. Fixes rh#498041

[Richard Hughes <rhughes src gnome org>]

commit 0f3d267a0007573f66e2bcfd7eed1b3c8126a8f7
Author: Kyle McMartin <kmcmartin redhat com>
Date:   Wed May 6 16:28:28 2009 +0100

    Only setup the blanking timeout when a timeout is set. Fixes rh#498041
    
    Signed-off-by: Richard Hughes <richard hughsie com>
---
 src/gpm-idle.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/gpm-idle.c b/src/gpm-idle.c
index 3e515e6..dbbd637 100644
--- a/src/gpm-idle.c
+++ b/src/gpm-idle.c
@@ -230,15 +230,18 @@ gpm_idle_evaluate (GpmIdle *idle)
 		gpm_idle_set_mode (idle, GPM_IDLE_MODE_DIM);
 	}
 
-	/* set up blank callback even when session is not idle */
-	if (idle->priv->timeout_blank_id == 0) {
+	/* set up blank callback even when session is not idle,
+	 * but only if we actually want to blank. */
+	if (idle->priv->timeout_blank_id == 0 &&
+	    idle->priv->timeout_blank != 0) {
 		egg_debug ("setting up blank callback");
 		idle->priv->timeout_blank_id = g_timeout_add_seconds (idle->priv->timeout_blank, (GSourceFunc) gpm_idle_blank_cb, idle);
 	}
 
 	/* only do the sleep timeout when the session is idle */
 	if (is_idle) {
-		if (idle->priv->timeout_sleep_id == 0) {
+		if (idle->priv->timeout_sleep_id == 0 &&
+		    idle->priv->timeout_sleep != 0) {
 			egg_debug ("setting up sleep callback = %i", idle->priv->timeout_blank);
 			idle->priv->timeout_sleep_id = g_timeout_add_seconds (idle->priv->timeout_sleep, (GSourceFunc) gpm_idle_sleep_cb, idle);
 		}