File powersave-add-support_IBM_brightess_VistaBIOS.diff of Package powersave

Index: daemon/brightness.h
===================================================================
--- daemon/brightness.h	(Revision 3114)
+++ daemon/brightness.h	(Arbeitskopie)
@@ -83,6 +83,8 @@
 };
 
 class BrightnessIBM:public Brightness {
+      protected:
+	int brt_levels;
       public:
 	void Init();
 
Index: daemon/brightness.cpp
===================================================================
--- daemon/brightness.cpp	(Revision 3114)
+++ daemon/brightness.cpp	(Arbeitskopie)
@@ -39,6 +39,7 @@
 #include <linux/pmu.h>
 
 #include "powerlib.h"
+#include "powersave_hal.h"
 /* merge #include "config_pm.h" */
 
 #include "brightness.h"
@@ -264,13 +265,16 @@
 void BrightnessIBM::Init()
 {
 	last_percent = -1;
+	brt_levels = -1;
 	iface = ACPI_IBM;
+
+	brt_levels = GetLevels();
 	return;
 }
 
 int BrightnessIBM::Get()
 {
-	char value[18];
+	char value[19];
 	int level;
 
 	if ((fd = open(iface, O_RDONLY)) < 0) {
@@ -279,12 +283,12 @@
 		goto out;
 	}
 
-	if (read(fd, &value, 17) == -1) {
+	if (read(fd, &value, 18) == -1) {
 		level = -1;
 		goto out;
 	}
 
-	sscanf(value, "level:%1d", &level);
+	sscanf(value, "level:%d\n", &level);
 
 out:
 	close(fd);
@@ -293,19 +297,24 @@
 
 void BrightnessIBM::Set(int level)
 {
-	char value[8];
+	char value[9];
+	size_t to_write = 7;
 
 	if ((fd = open(iface, O_RDWR)) < 0) {
 		perror(iface);
 		goto out;
 	}
 
-	if (level > 7)
-		level = 7;
+	if (level > (brt_levels-1))
+		level = brt_levels-1;
 	else if (level < 0)
 		level = 0;
+
+	if (level > 9) 
+		to_write = 8;
+
 	sprintf(value, "level %d", level);
-	if (write(fd, value, 7) < 0) {
+	if (write(fd, value, to_write) < 0) {
 		pDebug(DBG_WARN,
 		       "Unable to write to IBM brightness interface");
 	}
@@ -323,13 +332,42 @@
 
 void BrightnessIBM::Med()
 {
-	Set(4);
+	Set(brt_levels/2);
 	return;
 }
 
 int BrightnessIBM::GetLevels()
 {
-	return 8;
+	if (brt_levels != -1) {
+		return brt_levels; 
+	} else {
+		if (!ps_hal_init()) {
+			return -1;
+		}
+
+		char **ibm_panel_devs;
+		int levels = -1;
+		int num_devs;
+
+		ibm_panel_devs = libhal_manager_find_device_string_match(ps_hal_context(),
+									 "linux.acpi_path",
+									 "/proc/acpi/ibm/brightness",
+									 &num_devs,
+									 ps_hal_dbus_error());
+
+		pDebug(DBG_INFO, "Found %d IBM panels devices", num_devs);
+
+		if (num_devs == 0) {
+			libhal_free_string_array(ibm_panel_devs);
+			return -1;
+		}
+
+		/* we can assume that there is only one such device for now */
+		levels = ps_hal_get_property_int(ibm_panel_devs[0], "laptop_panel.num_levels");
+		libhal_free_string_array(ibm_panel_devs);
+
+		return levels;
+	}
 }
 
 /* Brightness (Sony object) */