diff -Nru xfce4-battery-plugin-0.5.0-old/panel-plugin/libacpi.c xfce4-battery-plugin-0.5.0/panel-plugin/libacpi.c
--- xfce4-battery-plugin-0.5.0-old/panel-plugin/libacpi.c	2007-04-29 15:08:23.670477251 +0000
+++ xfce4-battery-plugin-0.5.0/panel-plugin/libacpi.c	2007-04-29 15:17:23.213224040 +0000
@@ -207,10 +207,10 @@
 #ifdef __linux__
   FILE *acpi;
 
-  if (!(acpi = fopen ("/proc/acpi/info", "r")))
+  if ( (!(acpi = fopen ("/proc/acpi/info", "r"))) && (!(acpi = fopen ("/sys/module/acpi/parameters/acpica_version", "r"))) )
   {
 #ifdef DEBUG
-	  printf("DBG:no acpi: /proc/acpi/info not found!\n");
+	  printf("DBG:no acpi: /proc/acpi/info and /sys/module/acpi/parameters/acpica_version not found!\n");
 #endif
     return 1;
   }