Hi, sorry but the previous patch-file is erroneous. In attachment there is the new (good) patch-file.
Ciao, IsMaEl
diff -urN xfce4-battery-plugin-0.5.0/panel-plugin/libacpi.c xfce4-battery-plugin-0.5.0-new/panel-plugin/libacpi.c --- xfce4-battery-plugin-0.5.0/panel-plugin/libacpi.c 2007-01-17 18:56:51.000000000 +0100 +++ xfce4-battery-plugin-0.5.0-new/panel-plugin/libacpi.c 2007-07-25 12:03:41.000000000 +0200 @@ -190,10 +190,12 @@ #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 or " + "/sys/module/acpi/parameters/acpica_version not found!\n"); #endif return 1; }