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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2010-08-09 23:48:18 -0300
committerMatthew Garrett <mjg@redhat.com>2010-08-16 11:54:47 -0400
commit122f26726b5e16174bf8a707df14be1d93c49d62 (patch)
tree7e71e1fa0c2dda912796f1cb9fd1f1f71bb872e4 /Documentation
parent52d7ee558d3babb4918eed6769f593adc1b6616e (diff)
thinkpad-acpi: find ACPI video device by synthetic HID
The Linux ACPI core locates the ACPI video devices for us and marks them with ACPI_VIDEO_HID. Use that information to locate the video device instead of a half-baked hunt for _BCL. This uncouples the detection of the number of backlight brightness levels on ThinkPads from the ACPI paths in vid_handle. With this change, the driver should be able to always detect whether the ThinkPad uses a 8-level or 16-level brightness scale even on newer models for which the vid_handle paths have not been updated yet. It will skip deactivated devices in the ACPI device tree, which is a change in behaviour. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Signed-off-by: Matthew Garrett <mjg@redhat.com>
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