From: Matthew Garrett <mjg59@srcf.ucam.org>
To: AceLan Kao <acelan.kao@canonical.com>
Cc: "platform-driver-x86@vger.kernel.org"
<platform-driver-x86@vger.kernel.org>
Subject: Re: [PATCH] dell-wmi: Add quirk for Dell Inspiron 3138
Date: Tue, 3 Dec 2013 07:40:50 +0000 [thread overview]
Message-ID: <20131203074050.GA323@srcf.ucam.org> (raw)
In-Reply-To: <CAMz9Wg-hQx17hBN=RUrrrwR+LfSwgq=XTzLihK4k0KeEn=BN2Q@mail.gmail.com>
On Tue, Dec 03, 2013 at 03:31:45PM +0800, AceLan Kao wrote:
> Hi Matthew,
>
> Sorry, I don't understand what you mean.
>
> Let me explain it again.
> The BIOS engineer refuse to remove the ACPI functions(_BCM) in BIOS code,
> so we'll have acpi_video0 interface be created under
> /sys/class/backlight/ and that interface doesn't work.
> This patch is equal to add this kernel command line "acpi_backlight=vendor"
> So that, there will be no acpi_video0 be create, and we will use
> intel_backlight interface instead.
Right. This isn't a Dell-specific problem. Windows 8 doesn't use the
ACPI backlight interface, so any system that calls _OSI("Windows 2012")
should use the Intel interface instead. It needs to be fixed in general,
not in the platform drivers.
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2013-12-03 7:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-03 6:50 [PATCH] dell-wmi: Add quirk for Dell Inspiron 3138 AceLan Kao
2013-12-03 7:07 ` Matthew Garrett
2013-12-03 7:31 ` AceLan Kao
2013-12-03 7:40 ` Matthew Garrett [this message]
2013-12-04 8:14 ` AceLan Kao
2013-12-04 11:15 ` Matthew Garrett
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