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Disable firmware video brightness change on AC/Battery switch by default
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-- mjg59
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diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
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index bac2901..93b1a9e 100644
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--- a/drivers/acpi/video.c
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+++ b/drivers/acpi/video.c
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@@ -1818,7 +1818,7 @@ static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
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 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
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 {
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-	return acpi_video_bus_DOS(video, 0, 0);
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+	return acpi_video_bus_DOS(video, 0, 1);
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 }
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 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)