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8a681a4dee
Introduce new module parameter for brightness control. "brightness_switch_enabled" is set by default which means nothing changes upon brightness switch events. When "brightness_switch_enabled" is cleared via "echo 0 > /sys/module/video/parameters/brightness_switch_enabled", ACPI will not try to change the brightness level any more. Either X will take charge of this or users can change the brightness level by poking /sys/class/backlight/acpi_videoX/... Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>