From 22c13f9d8179f4c9caecfcb60a95214562b9addc Mon Sep 17 00:00:00 2001 From: Thomas Renninger Date: Fri, 1 Aug 2008 17:37:54 +0200 Subject: ACPI: video: Ignore devices that aren't present in hardware This is a reimplemention of commit 0119509c4fbc9adcef1472817fda295334612976 from Matthew Garrett This patch got removed because of a regression: ThinkPads with a Intel graphics card and an Integrated Graphics Device BIOS implementation stopped working. In fact, they only worked because the ACPI device of the discrete, the wrong one, got used (via int10). So ACPI functions were poking on the wrong hardware used which is a sever bug. The next patch provides support for above ThinkPads to be able to switch brightness via the legacy thinkpad_acpi driver and automatically detect when to use it. Original commit message from Matthew Garrett: Vendors often ship machines with a choice of integrated or discrete graphics, and use the same DSDT for both. As a result, the ACPI video module will locate devices that may not exist on this specific platform. Attempt to determine whether the device exists or not, and abort the device creation if it doesn't. http://bugzilla.kernel.org/show_bug.cgi?id=9614 Signed-off-by: Thomas Renninger Acked-by: Zhang Rui Signed-off-by: Andi Kleen Signed-off-by: Len Brown --- include/acpi/acpi_bus.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/acpi') diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 54a279e4..e9f6574 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -380,6 +380,8 @@ struct acpi_bus_type { int register_acpi_bus_type(struct acpi_bus_type *); int unregister_acpi_bus_type(struct acpi_bus_type *); struct device *acpi_get_physical_device(acpi_handle); +struct device *acpi_get_physical_pci_device(acpi_handle); + /* helper */ acpi_handle acpi_get_child(acpi_handle, acpi_integer); acpi_handle acpi_get_pci_rootbridge_handle(unsigned int, unsigned int); -- cgit v1.1