path: root/Documentation
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authorThomas Renninger <>2008-08-01 17:37:54 +0200
committerLen Brown <>2008-11-07 23:49:23 -0500
commit22c13f9d8179f4c9caecfcb60a95214562b9addc (patch)
tree3bf73f6e3e9c95cab2811b6a190ed804cbca2eca /Documentation
parentfed4d59b6ec5481caceb17863f19a0b0e5eaa939 (diff)
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. Signed-off-by: Thomas Renninger <> Acked-by: Zhang Rui <> Signed-off-by: Andi Kleen <> Signed-off-by: Len Brown <>
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