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Based on analysis and a patch from Matthew Garrett <mjg59@srcf.ucam.org>. Instruct the ThinkPad ACPI firmware to remove delays on the processing of backlight brightness changes. This method is present on ThinkPad Vista-compatible BIOSes with standard ACPI backlight level control. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Yves-Alexis Perez <corsac@debian.org> Signed-off-by: Len Brown <len.brown@intel.com>