Actually, there's no point only attaching it at bugzilla, since the relevant output is shorter than I thought: /proc/cmdline: auto BOOT_IMAGE=16-rc5 ro root=305 idebus=66 apm=off acpi=force pci=noacpi console=ttyS0,115200 console=tty0 acpi_sleep=s3_bios cpufreq.debug=7 acpi_debug=0xffffffff where 16-rc5 is my LILO label for 2.6.16-rc5 The extract from the dmesgs: Stopping tasks: ========================================================| Execute Method: [\_SB_.LID0._PSW] (Node c1564808) exregion-0185 [35] ex_system_memory_space: system_memory 0 (32 width) Address=0000000023FDFF40 acpi_ec-0458 [37] ec_intr_read : Read [02] from address [32] acpi_ec-0508 [37] ec_intr_write : Wrote [06] to address [32] Execute Method: [\_SB_.SLPB._PSW] (Node c1564708) Execute Method: [\_S3_] (Node c157a988) exregion-0185 [35] ex_system_memory_space: system_memory 0 (32 width) Address=0000000023FDFF40 Execute Method: [\_PTS] (Node c157ab48) exregion-0185 [35] ex_system_memory_space: system_memory 0 (32 width) Address=0000000023FDFF40 exregion-0185 [35] ex_system_memory_space: system_memory 0 (32 width) Address=0000000023FDFF40 exregion-0185 [35] ex_system_memory_space: system_memory 0 (32 width) Address=0000000023FDFF40 exregion-0185 [36] ex_system_memory_space: system_memory 0 (32 width) Address=0000000023FDFFC0 exregion-0185 [36] ex_system_memory_space: system_memory 1 (32 width) Address=0000000023FDFFC0 exregion-0185 [36] ex_system_memory_space: system_memory 0 (32 width) Address=0000000023FDFFC4 exregion-0185 [36] ex_system_memory_space: system_memory 1 (32 width) Address=0000000023FDFFC4 exregion-0185 [35] ex_system_memory_space: system_memory 0 (32 width) Address=0000000023FDFFC0 exregion-0290 [36] ex_system_io_space_han: system_iO 1 (8 width) Address=00000000000000B2 exregion-0185 [35] ex_system_memory_space: system_memory 0 (32 width) Address=0000000023FDFFC0 exregion-0185 [36] ex_system_memory_space: system_memory 0 (32 width) Address=0000000023FDFFC0 exregion-0185 [36] ex_system_memory_space: system_memory 1 (32 width) Address=0000000023FDFFC0 exregion-0290 [36] ex_system_io_space_han: system_iO 1 (8 width) Address=00000000000000B2 And then these above four lines (exregion-0185, -0185, -0185, -0290) repeat until I reboot. -Sanjoy `Never underestimate the evil of which men of power are capable.' --Bertrand Russell, _War Crimes in Vietnam_, chapter 1. - : send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html