On Fri, 12 Nov 2010, Zhang Rui wrote: > On Thu, 2010-11-11 at 06:02 +0800, Alan Stern wrote: > > Rui: > > > > Why does CONFIG_ACPI_VIDEO depend on BACKLIGHT_CLASS_DEVICE? Doesn't > > ACPI_VIDEO apply to any sort of video adapter, including plain old VGA > > adapters attached to a non-LCD device? > > > There is an ACPI device node (an ACPI video bus device) for the VGA > controller and another ACPI device node (an ACPI video output device) > for the LCD display. > And ACPI_VIDEO knows how to switch the backlight of this integrated > LCD. :) But my computer doesn't have an LCD display. It's a desktop, not a laptop. So why do I need BACKLIGHT_CLASS_DEVICE to be enabled? Are you saying I don't need ACPI_VIDEO if the machine doesn't have an integrated LCD display? That doesn't agree with the Kconfig help message. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
