Zhao Yakui wrote: > > Peter Anvin suggests that OS attempt reboot via 0xCF9 port if avaiable. > This is not very good. 0xCF9 I/O port is the reset control register > defined in Intel ICH6/7/8/9 chipset. In theory it is effective for Intel > chipset. Maybe it is not applied for other chipset(For example: Nvidia, > ALI, VIA). There exists a laptop in bug 11942, in which the 0xCF9 I/O > port is defined as the RESET_REG. But unfortunately it can't be rebooted > Via 0xCF9 I/O port. > In fact although the 0xCF9 is defined for Intel ICH chipset, it > doesn't mean that all the box based on ICH chipset can be rebooted via > 0xCF9 I/O port. For example: we have a laptop based on intel ICH6 > chipset that can't be rebooted by writing the 0x06 to 0xCF9 I/O port. > Port CF9 isn't universal, but other vendors are increasingly implementing it -- I know ALi are in their more recent chipsets. Either way, I agree that we need to figure out how to get ACPI to work, but CF9 is a low risk fallback before going to the KBC. -hpa -- 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
