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Rafael J. Wysocki 8e5c2b776a Revert "ACPI / video / i915: No ACPI backlight if firmware expects Windows 8" ... We attempted to address a regression introduced by commit a57f7f9 (ACPICA: Add Windows8/Server2012 string for _OSI method.) after which ACPI video backlight support doesn't work on a number of systems, because the relevant AML methods in the ACPI tables in their BIOSes become useless after the BIOS has been told that the OS is compatible with Windows 8. That problem is tracked by the bug entry at: https://bugzilla.kernel.org/show_bug.cgi?id=51231 Commit 8c5bd7a (ACPI / video / i915: No ACPI backlight if firmware expects Windows 8) introduced for this purpose essentially prevented the ACPI backlight support from being used if the BIOS had been told that the OS was compatible with Windows 8 and the i915 driver was loaded, in which case the backlight would always be handled by i915. Unfortunately, however, that turned out to cause problems with backlight to appear on multiple systems with symptoms indicating that i915 was unable to control the backlight on those systems as expected. For this reason, revert commit 8c5bd7a, but leave the function acpi_video_backlight_quirks() introduced by it, because another commit on top of it uses that function. References: https://lkml.org/lkml/2013/7/21/119 References: https://lkml.org/lkml/2013/7/22/261 References: https://lkml.org/lkml/2013/7/23/429 References: https://lkml.org/lkml/2013/7/23/459 References: https://lkml.org/lkml/2013/7/23/81 References: https://lkml.org/lkml/2013/7/24/27 Reported-and-tested-by: James Hogan <james@albanarts.com> Reported-and-tested-by: Kamal Mostafa <kamal@canonical.com> Reported-and-tested-by: Jörg Otte <jrg.otte@gmail.com> Reported-and-tested-by: Steven Newbury <steve@snewbury.org.uk> Reported-by: Martin Steigerwald <Martin@lichtvoll.de> Reported-by: Kalle Valo <kvalo@adurom.com> Tested-by: Joerg Platte <jplatte@naasa.net> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>		12 years ago
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platform	…
acbuffer.h	…
acconfig.h	ACPICA: Add argument typechecking for all predefined ACPI names	12 years ago
acexcep.h	…
acnames.h	…
acoutput.h	ACPICA: Remove unused macros, no functional change	12 years ago
acpi.h	…
acpi_bus.h	PCI changes for the v3.11 merge window:	12 years ago
acpi_drivers.h	ACPI / dock / PCI: Synchronous handling of dock events for PCI devices	12 years ago
acpi_numa.h	…
acpiosxf.h	ACPI: Fix section to __init. Align with usage in acpixf.h	12 years ago
acpixf.h	ACPICA: expose OSI version	12 years ago
acrestyp.h	…
actbl.h	…
actbl1.h	…
actbl2.h	…
actbl3.h	…
actypes.h	ACPICA: expose OSI version	12 years ago
apei.h	…
button.h	…
ghes.h	…
hed.h	…
pdc_intel.h	…
processor.h	ACPI / processor: Use common hotplug infrastructure	12 years ago
reboot.h	…
video.h	Revert "ACPI / video / i915: No ACPI backlight if firmware expects Windows 8"	12 years ago