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Commit b2ca5dae authored by Colin Ian King's avatar Colin Ian King Committed by Rafael J. Wysocki
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ACPI: Add acpi_force_32bit_fadt_addr option to force 32 bit FADT addresses 

Some HP laptops seem to have invalid 64 bit FADT X_PM* addresses
which are causing various boot issues.  In these cases, it would
be useful to force ACPI to use the valid legacy 32 bit equivalent
PM addresses.  Add a acpi_force_32bit_fadt_addr to set the ACPICA
acpi_gbl_use32_bit_fadt_addresses to TRUE to force this override.

Link: https://bugs.launchpad.net/bugs/1529381


Signed-off-by: default avatarColin Ian King <colin.king@canonical.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 75829dcf

Documentation/kernel-parameters.txt

+6 −0
Original line number Diff line number Diff line
@@ -193,6 +193,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 
			(e.g. thinkpad_acpi, sony_acpi, etc.) instead

			of the ACPI video.ko driver.



	acpi_force_32bit_fadt_addr

			force FADT to use 32 bit addresses rather than the

			64 bit X_* addresses. Some firmware have broken 64

			bit addresses for force ACPI ignore these and use

			the older legacy 32 bit addresses.



	acpica_no_return_repair [HW, ACPI]

			Disable AML predefined validation mechanism

			This mechanism can repair the evaluation result to make

drivers/acpi/tables.c

+10 −0
Original line number Diff line number Diff line
@@ -484,3 +484,13 @@ static int __init acpi_force_table_verification_setup(char *s) 
}



early_param("acpi_force_table_verification", acpi_force_table_verification_setup);



static int __init acpi_force_32bit_fadt_addr(char *s)

{

	pr_info("Forcing 32 Bit FADT addresses\n");

	acpi_gbl_use32_bit_fadt_addresses = TRUE;



	return 0;

}



early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);