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>		2013-07-26 14:59:20 +02:00
..
acpi	Revert "ACPI / video / i915: No ACPI backlight if firmware expects Windows 8"	2013-07-26 14:59:20 +02:00
asm-generic	Merge branch 'cpuinit-delete' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux	2013-07-07 11:01:19 -07:00
clocksource
crypto
drm	drm/cma: remove GEM CMA specific dma_buf functionality	2013-07-05 15:44:54 +10:00
dt-bindings	ARM: at91: dt: add header to define at_hdmac configuration	2013-07-05 11:40:53 +05:30
keys
kvm	ARM: KVM: Allow host virt timer irq to be different from guest timer virt irq	2013-06-26 10:50:02 -07:00
linux	Revert "ACPI / video / i915: No ACPI backlight if firmware expects Windows 8"	2013-07-26 14:59:20 +02:00
math-emu
media	[media] exynos4-is: Correct colorspace handling at FIMC-LITE	2013-06-28 15:33:27 -03:00
memory
misc
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-07-13 17:42:22 -07:00
pcmcia
ras
rdma	Merge branches 'af_ib', 'cxgb4', 'misc', 'mlx5', 'ocrdma', 'qib' and 'srp' into for-next	2013-07-08 11:22:11 -07:00
rxrpc
scsi	[SCSI] libiscsi: Added new boot entries in the session sysfs	2013-06-26 18:04:11 -07:00
sound	ASoC: More updates for v3.11	2013-06-28 13:36:22 +02:00
target	target: make queue_tm_rsp() return void	2013-07-07 18:36:53 -07:00
trace	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2013-07-11 12:57:19 -07:00
uapi	allow O_TMPFILE to work with O_WRONLY	2013-07-20 03:11:32 +04:00
video	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2013-07-09 16:04:31 -07:00
xen	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2013-07-09 18:24:39 -07:00
Kbuild