Re: [PATCH 2/2] ACPI Check for backlight support via ACPI video.ko otherwise use vendor ACPI drivers

Matthew Garrett
2008-07-03T16:21:52Z

On Thu, Jul 03, 2008 at 06:08:59PM +0200, Thomas Renninger wrote:

> + if (ACPI_SUCCESS(acpi_get_handle(device->handle, "DRDY", &h_dummy))) {
> + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IGD device\n"));
> + video_caps |= ACPI_VIDEO_IGD;
> + }

In principle, it's possible for a vendor to implement opregion but not
actually use it until the tche flags are set. If anyone's done that then
you've just broken backlight control on their system.