[PATCH 3/3] APM Screen Blanking fix

[Jordan Crouse]

A simple patch to fix APM assisted screen blanking (this at least fixes
a issue with the Geode LX BIOS).  Reposted from before with no changes.

APM screen blanking fix.

This patch fixes screen blanking on BIOSes that return
APM_NOT_ENGAGED when APM enabled screen blanking is not
turned on.

Signed off by: Jordan Crouse <jordan.crouse@xxxxxxx>
---

 arch/i386/kernel/apm.c |   27 ++++++++++++++-------------
 1 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
index 1e60acb..03e9d84 100644
--- a/arch/i386/kernel/apm.c
+++ b/arch/i386/kernel/apm.c
@@ -1075,22 +1075,23 @@ static int apm_engage_power_management(u
  
 static int apm_console_blank(int blank)
 {
-	int	error;
-	u_short	state;
+	int error, i;
+	u_short state;
+	u_short dev[3] = { 0x100, 0x1FF, 0x101 };
 
 	state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
-	/* Blank the first display device */
-	error = set_power_state(0x100, state);
-	if ((error != APM_SUCCESS) && (error != APM_NO_ERROR)) {
-		/* try to blank them all instead */
-		error = set_power_state(0x1ff, state);
-		if ((error != APM_SUCCESS) && (error != APM_NO_ERROR))
-			/* try to blank device one instead */
-			error = set_power_state(0x101, state);
+
+	for (i = 0; i < 3; i++) {
+		error = set_power_state(dev[i], state);
+
+		if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
+			return 1;
+
+		if (error == APM_NOT_ENGAGED)
+			break;
 	}
-	if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
-		return 1;
-	if (error == APM_NOT_ENGAGED) {
+
+	if (error == APM_NOT_ENGAGED && state != APM_STATE_READY) {
 		static int tried;
 		int eng_error;
 		if (tried++ == 0) {