Hi all, I spent lots of hours trying to figure out why my T400 would not enter C4 and C6 sleep states. Here are my findings: - When a USB device is connected, even if it supports USB autosuspend, the cpu will never go down more than C3 (apparently the mode is disabled by the BIOS). - After removing all the USB devices, in AC it enters C4 and in battery it enters C6. The BIOS apparently replaces C3 with C4 and C6, respectively, because /sys/devices/system/cpu/cpu0/cpuidle/ always shows 4 states, whatever the situation. So one more reason not to use USB devices while on battery... Is this normal behaviour or I have a retarded BIOS? And if so, is there a workaround? (please mail directly to me as in not in the linux-acpi list) Regards, Pedro -- 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
