Thanks for the dmidecode. please send me the output from acpidump. -Len BIOS Information Vendor: Acer Version: V2.83 Release Date: 03/21/2007 Address: 0xE48B0 Runtime Size: 112464 bytes ROM Size: 1024 kB Characteristics: ... Handle 0x0001, DMI type 1, 27 bytes System Information Manufacturer: Acer Product Name: Aspire 3100 Version: V2.83 Serial Number: LXAX60Y180720115D31601 UUID: 6356DBD0-2A29-1BD4-04E3-0016D4D77FFF Wake-up Type: Power Switch SKU Number: Not Specified Family: Not Specified Handle 0x0002, DMI type 2, 8 bytes Base Board Information Manufacturer: Acer Product Name: Navarro Version: N/A Serial Number: LXAX60Y180720115D31601 - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html