So, is this the bottom line of the hwsleep patch:
If there is a second FACS in the system (pointed to by the unused RSDT), then set the firmware waking vectors in BOTH FACS tables?
>-----Original Message-----
>From: Zhang, Rui
>Sent: Monday, October 13, 2008 1:11 AM
>To: Len Brown
>Cc: linux-acpi; Moore, Robert; Rafael J. Wysocki; Zhang, Rui
>Subject: [PATCH 5/6] ACPI: set waking vector in inactive facs table
>
>
>RSDT and XSDT may export different FACS tables.
>Some of the BIOSes only checks one of them when resuming.
>And Linux reboots instead of resuming because BIOS can't find
>the waking vector.
>For example,
>I have a platform which suspends well, but always reboots instead of
>resuming when pressing the power button.
>I found that there are two FACS tables on this platform,
>XSDT-->FADT1-->Xfacs-->FACS1
> |----->facs-|
> |->FACS2
>RSDT-->FADT2-->facs-|
>Linux uses XSDT on this platform and sets the waking vector in FACS1
>when suspending.
>But it seems that the BIOS only cares for the waking vector in FACS2,
>thus it reboots when resuming because the waking vector is not set at all.
>
>Set the waking vector in inactive FACS table in this patch.
>
>Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
>---
> drivers/acpi/hardware/hwsleep.c | 20 ++++++++++++++++++++
> drivers/acpi/tables/tbfadt.c | 6 ++++--
> 2 files changed, 24 insertions(+), 2 deletions(-)
>
>Index: linux-2.6/drivers/acpi/hardware/hwsleep.c
>===================================================================
>--- linux-2.6.orig/drivers/acpi/hardware/hwsleep.c
>+++ linux-2.6/drivers/acpi/hardware/hwsleep.c
>@@ -65,6 +65,7 @@ acpi_set_firmware_waking_vector(acpi_phy
> {
> struct acpi_table_facs *facs;
> acpi_status status;
>+ u32 table_index;
>
> ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
>
>@@ -92,6 +93,25 @@ acpi_set_firmware_waking_vector(acpi_phy
> facs->xfirmware_waking_vector = physical_address;
> }
>
>+ /* set the firmware vector in the inactive facs table */
>+ for (table_index = 0, facs = NULL; ; table_index++) {
>+ status = acpi_get_inactive_table_by_index(table_index,
>+ ACPI_CAST_INDIRECT_PTR(struct
>acpi_table_header,
>+ &facs));
>+ if (status == AE_TABLE_NOT_SUPPORTED)
>+ continue;
>+ if (ACPI_FAILURE(status))
>+ break;
>+
>+ if (!ACPI_COMPARE_NAME(&facs->signature, ACPI_SIG_FACS))
>+ continue;
>+
>+ if (facs->version >= 1)
>+ facs->xfirmware_waking_vector = 0;
>+ facs->firmware_waking_vector = (u32)physical_address;
>+ break;
>+ }
>+
> return_ACPI_STATUS(AE_OK);
> }
>
>Index: linux-2.6/drivers/acpi/tables/tbfadt.c
>===================================================================
>--- linux-2.6.orig/drivers/acpi/tables/tbfadt.c
>+++ linux-2.6/drivers/acpi/tables/tbfadt.c
>@@ -290,11 +290,13 @@ static void acpi_tb_convert_fadt(void)
>
> if (!acpi_gbl_FADT.Xfacs) {
> acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
>- }
>+ } else if (acpi_gbl_FADT.Xfacs != acpi_gbl_FADT.facs)
>+ ACPI_WARNING((AE_INFO, "32 bit FACS and 64 bit FACS not
>match\n"));
>
> if (!acpi_gbl_FADT.Xdsdt) {
> acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
>- }
>+ } else if (acpi_gbl_FADT.Xdsdt != acpi_gbl_FADT.dsdt)
>+ ACPI_WARNING((AE_INFO, "32 bit DSDT and 64 bit DSDT not
>match\n"));
>
> /*
> * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved
>fields which
>
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