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@xxxxxxxxxxxxx
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