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Message-ID: <CAMP44s2B=nQLnZm7gyYAJZgt_x3KszRZLUC=fom0t9=Eze+smA@mail.gmail.com> Date: Wed, 31 Jul 2013 06:32:47 -0500 From: Felipe Contreras <felipe.contreras@...il.com> To: Matthew Garrett <mjg59@...f.ucam.org> Cc: "Rafael J. Wysocki" <rjw@...k.pl>, Aaron Lu <aaron.lwe@...il.com>, linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org, Len Brown <lenb@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org> Subject: Re: [REGRESSION/PATCH] acpi: blacklist win8 OSI for ASUS Zenbok Prime UX31A On Wed, Jul 31, 2013 at 12:14 AM, Matthew Garrett <mjg59@...f.ucam.org> wrote: > On Tue, Jul 30, 2013 at 07:11:06PM -0500, Felipe Contreras wrote: > >> No, the ACPI driver is exposing a backlight interface, which has a >> defined stable API. > > From the ACPI spec: > > 'The OEM may define the number 0 as "Zero brightness" that can mean to > turn off the lighting (e.g. LCD panel backlight) in the device.' > > There's no mechanism for an OS to know whether or not a firmware > implementation will actually turn the backlight off at 0, so there's no > way the OS can define the lowest backlight state as anything other than > "May or may not turn the screen off". Yes there is; quirks. -- Felipe Contreras -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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