On Wed, Apr 25, 2012 at 01:24:38PM +0100, Alan Cox wrote: > Because as I said before there are two drivers involved and you may only > have one compiled into your kernel. If you have > > CONFIG_DRM_GMA500=y > CONFIG_DRM_I915=n > > you want the acpi stuff to autoregister even if an i915 is found, but not > if a GMA500 is found. Ditto the reverse. No you don't - there's various platforms that will hang if you do that. It's necessary to make sure that the DIDL fields are set up before calling any ACPI video functions on opregion hardware. -- Matthew Garrett | mjg59@xxxxxxxxxxxxx -- 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