diff -aur acpitool-0.4.7.pristine/src/acpitool.cpp acpitool-0.4.7.new/src/acpitool.cpp
--- acpitool-0.4.7.pristine/src/acpitool.cpp	2007-02-06 21:03:02.000000000 +0100
+++ acpitool-0.4.7.new/src/acpitool.cpp	2007-05-15 13:25:26.000000000 +0200
@@ -56,13 +56,14 @@
     filename = "/proc/acpi/info";
     
     file_in.open(filename);
-    if (!file_in)
-    	return 0;
-    else
-    {
-	file_in.close();
-        return 1;
+    if(!file_in.is_open()) {
+	filename = "/sys/module/acpi/parameters/acpica_version";
+	file_in.open(filename);
     }
+    if(!file_in.is_open()) return 0;
+    
+    file_in.close();
+    return 1;
 }
     
 int Print_ACPI_Info(int show_ac, int show_therm, int show_trip, int show_fan, int show_batteries, int show_empty, int show_version, int show_cpu, int show_wake, int e_set, int info_level, int verbose)
@@ -98,26 +99,38 @@
     filename = "/proc/acpi/info";
     
     file_in.open(filename);
-    if (!file_in)
-    {
-    	if(!verbose)
-    	{
-	    strcpy(c, "<n.a>");
-    	    return 0;
-    	}
-    	else
-    	{
-    	    cout<<"  Could not open file : "<<filename<<endl;
-	    cout<<"  Make sure your kernel has ACPI support enabled."<<endl;
-	    return -1;
-    	}	
+    if(!file_in.is_open()) {
+	filename = "/sys/module/acpi/parameters/acpica_version";
+        file_in.open(filename);
+    }
+    if(!file_in.is_open()) {
+	    // failure
+	    if(!verbose) {
+		    strcpy(c, "<n.a>");
+		    return 0;
+	    }
+	    else {
+		    cout<<"  Could not open file : "<<filename<<endl;
+		    cout<<"  Make sure your kernel has ACPI support enabled."<<endl;
+		    return -1;
+	    }
     }
        
     file_in.getline(str, 50);
     file_in.close();
     
-    /* version takes 8 chars starting from pos 26 */
-    strncpy(c, str+25,8);
+    // Find a better way to respect new ACPI behavior for
+    // kernel >2.6.20 !
+    // But hey, this is just a dirty patch 
+    if (strncmp(filename,"/sys",4)==0)
+    {
+	/* version takes 8 chars */
+	strncpy(c, str,8);
+    }
+    else {
+	/* version takes 8 chars starting from pos 26 */
+	strncpy(c, str+25, 8);
+    }
     
     return 0;
 }