於 一，2013-07-15 於 13:43 +0200，oliver@xxxxxxxxxx 提到：
> From: Oliver Neukum <oneukum@xxxxxxx>
>
> Some BIOSes change hardware based on the state of
> a laptop's lid. If the lid is closed, the touchpad is
> disabled and the checksum changes. Windows 8 no longer
> aborts resume if the checksum has changed.
>
> Signed-off-by: Oliver Neukum <oneukum@xxxxxxx>
> ---
> drivers/acpi/sleep.c | 8 +++-----
> 1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
> index 9c1a435..14744e5 100644
> --- a/drivers/acpi/sleep.c
> +++ b/drivers/acpi/sleep.c
> @@ -664,11 +664,9 @@ static void acpi_hibernation_leave(void)
> /* Reprogram control registers */
> acpi_leave_sleep_state_prep(ACPI_STATE_S4);
> /* Check the hardware signature */
> - if (facs && s4_hardware_signature != facs->hardware_signature) {
> - printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
> - "cannot resume!\n");
> - panic("ACPI S4 hardware signature mismatch");
> - }
> + if (facs && s4_hardware_signature != facs->hardware_signature)
> + printk(KERN_CRIT "ACPI: Hardware changed while hibernated, "
> + "success doubtful!\n");
> /* Restore the NVS memory area */
> suspend_nvs_restore();
> /* Allow EC transactions to happen. */
This morning I tried to reproduce the hardware_signature change on my
Acer notebook, I hope can monitor the change on Linux then use Windows 8
to check the behavior.
Unfortunately I can not reproduce the hardware_signature change by
remove memory or PCI device(wifi module) with Linux kernel.
For PCI device, as ACPI spec's declare, it didn't causes
hardware_signature change, I print out in acpi_hibernation_leave() to
confirm it.
For memory size, before the S4 resume path run to
acpi_hibernation_leave(), kernel check the physical memory pages number
in snapshot_write_next() then -EPERM if physical pages change . So, it
doesn't have chance to check the hardware_signature changed.
Base on the above testing, correct my originally thinking, the
hardware_signature check could not detect the change of memory size
because it's too late.
Sorry for I didn't find out the actual behavior of Windows 8 to confirm
it ignore hardware_signature change. At least could not verify on my
machine.
Thanks a lot!
Joey Lee
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