[Intel-gfx] [PATCH 1/5] Backlight: Add backlight type

Matthew Garrett mjg59 at srcf.ucam.org
Mon Nov 22 14:40:04 CET 2010

On Mon, Nov 22, 2010 at 01:35:48PM +0000, Richard Purdie wrote:

> Its the reverse situation I worry about. Are there situations where
> there are multiple connectors on the PCI device and the ACPI interface
> just controls one of them but controls for the other connectors may
> exist?

Yes, that's certainly possible and it'd be desirable to fix this up, but 
the same problem also applies to platform interfaces and it's typically 
unfixable there. My userspace implementation looks at the connector type 
to determine the best approach - if it's not LVDS or eDP it ignores the 
firmware and platform interfaces, so you'll fall back to the raw 
interface if it can provide support for your connector (presumably via 
ddcci, although we don't have this implemented yet)

Matthew Garrett | mjg59 at srcf.ucam.org

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