Zhao Yakui wrote: > I am sorry that I don't describe it very clearly. The value written into > 0xCF9 I/O port maybe vary on different chipset vendors. In such case it > is difficult to write the generic 0xCF9 reboot mechanism. If the same > standard about 0xCF9 I/O port is followed by most chipset vendors, it > will be OK. What my patch does is: u8 cf9 = inb(0xcf9) & ~6; outb(cf9|2, 0xcf9); /* Request hard reset */ udelay(50); outb(cf9|6, 0xcf9); /* Actually do the reset */ udelay(50); > I have a laptop on which the ACPI reboot mechanism is not supported.(The > reset flag is not present). But there exists the definition of RESET_REG > & RESET_VALUE. The RESET_REG is 0xCF9 I/O port. (The box is based on > Intel i915 chipsets) > When writing 0x06 to 0xCF9 I/O port the box will hang and can't be > rebooted. (Hardware reset will fail) > When writing 0x04 to 0xCF9 I/O port the box can be > rebooted.(Software reset is OK) What happens if you write 0x02 first, and *then* write 0x06? More details about this laptop, please? Also, what is RESET_REG and RESET_VALUE defined as? -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
