linux/drivers/acpi
Linus Torvalds ea45ea70b6 ACPI video support fixes for 3.11
- Change from Aaron Lu makes ACPICA export a variable which can be
   used by driver code to determine whether or not the BIOS believes
   that we are compatible with Windows 8.
 
 - Change from Matthew Garrett makes the ACPI video driver initialize
   the ACPI backlight even if it is not going to be used afterward
   (that is needed for backlight control to work on Thinkpads).
 
 - Fix from Rafael J Wysocki implements Windows 8 backlight support
   workaround making i915 take over bakclight control if the firmware
   thinks it's dealing with Windows 8.  Based on the work of multiple
   developers including Matthew Garrett, Chun-Yi Lee, Seth Forshee,
   and Aaron Lu.
 
 - Fix from Aaron Lu makes the kernel follow Windows 8 by informing
   the firmware through the _DOS method that it should not carry out
   automatic brightness changes, so that brightness can be controlled
   by GUI.
 
 /
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Merge tag 'acpi-video-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI video support fixes from Rafael Wysocki:
 "I'm sending a separate pull request for this as it may be somewhat
  controversial.  The breakage addressed here is not really new and the
  fixes may not satisfy all users of the affected systems, but we've had
  so much back and forth dance in this area over the last several weeks
  that I think it's time to actually make some progress.

  The source of the problem is that about a year ago we started to tell
  BIOSes that we're compatible with Windows 8, which we really need to
  do, because some systems shipping with Windows 8 are tested with it
  and nothing else, so if we tell their BIOSes that we aren't compatible
  with Windows 8, we expose our users to untested BIOS/AML code paths.

  However, as it turns out, some Windows 8-specific AML code paths are
  not tested either, because Windows 8 actually doesn't use the ACPI
  methods containing them, so if we declare Windows 8 compatibility and
  attempt to use those ACPI methods, things break.  That occurs mostly
  in the backlight support area where in particular the _BCM and _BQC
  methods are plain unusable on some systems if the OS declares Windows
  8 compatibility.

  [ The additional twist is that they actually become usable if the OS
    says it is not compatible with Windows 8, but that may cause
    problems to show up elsewhere ]

  Investigation carried out by Matthew Garrett indicates that what
  Windows 8 does about backlight is to leave backlight control up to
  individual graphics drivers.  At least there's evidence that it does
  that if the Intel graphics driver is used, so we've decided to follow
  Windows 8 in that respect and allow i915 to control backlight (Daniel
  likes that part).

  The first commit from Aaron Lu makes ACPICA export the variable from
  which we can infer whether or not the BIOS believes that we are
  compatible with Windows 8.

  The second commit from Matthew Garrett prepares the ACPI video driver
  by making it initialize the ACPI backlight even if it is not going to
  be used afterward (that is needed for backlight control to work on
  Thinkpads).

  The third commit implements the actual workaround making i915 take
  over backlight control if the firmware thinks it's dealing with
  Windows 8 and is based on the work of multiple developers, including
  Matthew Garrett, Chun-Yi Lee, Seth Forshee, and Aaron Lu.

  The final commit from Aaron Lu makes us follow Windows 8 by informing
  the firmware through the _DOS method that it should not carry out
  automatic brightness changes, so that brightness can be controlled by
  GUI.

  Hopefully, this approach will allow us to avoid using blacklists of
  systems that should not declare Windows 8 compatibility just to avoid
  backlight control problems in the future.

   - Change from Aaron Lu makes ACPICA export a variable which can be
     used by driver code to determine whether or not the BIOS believes
     that we are compatible with Windows 8.

   - Change from Matthew Garrett makes the ACPI video driver initialize
     the ACPI backlight even if it is not going to be used afterward
     (that is needed for backlight control to work on Thinkpads).

   - Fix from Rafael J Wysocki implements Windows 8 backlight support
     workaround making i915 take over bakclight control if the firmware
     thinks it's dealing with Windows 8.  Based on the work of multiple
     developers including Matthew Garrett, Chun-Yi Lee, Seth Forshee,
     and Aaron Lu.

   - Fix from Aaron Lu makes the kernel follow Windows 8 by informing
     the firmware through the _DOS method that it should not carry out
     automatic brightness changes, so that brightness can be controlled
     by GUI"

* tag 'acpi-video-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / video: no automatic brightness changes by win8-compatible firmware
  ACPI / video / i915: No ACPI backlight if firmware expects Windows 8
  ACPI / video: Always call acpi_video_init_brightness() on init
  ACPICA: expose OSI version
2013-07-21 10:11:04 -07:00
..
acpica ACPICA: expose OSI version 2013-07-18 01:29:14 +02:00
apei Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-07-04 10:29:23 -07:00
Kconfig Merge branch 'acpi-assorted' 2013-04-28 01:54:08 +02:00
Makefile Merge branch 'acpi-assorted' 2013-06-28 13:00:38 +02:00
ac.c ACPI / AC: Add sleep quirk for Thinkpad e530 2013-05-12 14:03:15 +02:00
acpi_cmos_rtc.c ACPI: Add CMOS RTC Operation Region handler support 2013-06-27 21:35:37 +02:00
acpi_i2c.c ACPI / I2C: Use parent's ACPI_HANDLE() in acpi_i2c_register_devices() 2013-04-02 15:30:41 +02:00
acpi_ipmi.c IPMI/ACPI: Add the IPMI opregion driver to enable ACPI to access BMC controller 2010-12-14 00:22:14 -05:00
acpi_lpss.c Merge branch 'acpi-lpss' 2013-06-28 12:59:02 +02:00
acpi_memhotplug.c ACPI / memhotplug: Fix a stale pointer in error path 2013-07-15 01:26:18 +02:00
acpi_pad.c ACPI / acpi_pad: Used PTR_RET 2013-03-25 00:13:15 +01:00
acpi_platform.c ACPI / scan: Add special handler for Intel Lynxpoint LPSS devices 2013-03-21 22:44:38 +01:00
acpi_processor.c acpi: delete __cpuinit usage from all acpi files 2013-07-14 19:36:58 -04:00
battery.c ACPI / battery: Make sure all spaces are in correct places 2013-06-19 23:34:58 +02:00
bgrt.c efi: Fix the ACPI BGRT driver for images located in EFI boot services memory 2012-09-29 12:21:03 -07:00
blacklist.c acpi: delete module.h include from files explicitly not needing it 2011-10-31 19:30:33 -04:00
bus.c ACPI: Remove useless initializers 2013-06-19 23:34:58 +02:00
button.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-05-01 17:51:54 -07:00
cm_sbs.c ACPI: Move definition of PREFIX from acpi_bus.h to internal..h 2009-08-28 19:57:27 -04:00
container.c Merge branch 'acpi-assorted' 2013-04-28 01:54:08 +02:00
custom_method.c The sweeping change is to make add_taint() explicitly indicate whether to disable 2013-02-25 15:41:43 -08:00
debugfs.c acpi: add export.h to files using THIS_MODULE/EXPORT_SYMBOL 2011-10-31 19:30:34 -04:00
device_pm.c ACPI / PM: Fix corner case in acpi_bus_update_power() 2013-07-04 13:22:11 +02:00
dock.c ACPI / dock: Actually define acpi_dock_init() as void 2013-07-04 13:25:04 +02:00
ec.c ACPI / EC: Add HP Folio 13 to ec_dmi_table in order to skip DSDT scan 2013-06-27 21:37:18 +02:00
ec_sys.c ACPI / EC: access user space with get_user()/put_user() 2013-06-19 23:29:20 +02:00
event.c acpi: add export.h to files using THIS_MODULE/EXPORT_SYMBOL 2011-10-31 19:30:34 -04:00
fan.c ACPI / fan: Initialize acpi_state variable 2013-07-04 13:33:25 +02:00
glue.c Merge branch 'acpi-assorted' 2013-06-28 13:00:38 +02:00
hed.c ACPI: Remove useless type argument of driver .remove() operation 2013-01-26 00:37:24 +01:00
internal.h ACPI / video / i915: No ACPI backlight if firmware expects Windows 8 2013-07-18 02:08:06 +02:00
numa.c x86, ACPI, mm: Revert movablemem_map support 2013-03-02 09:34:39 -08:00
nvs.c ACPI / PM: print physical addresses consistently with other parts of kernel 2012-03-30 02:46:57 -04:00
osl.c Merge branch 'acpi-assorted' 2013-06-29 15:03:44 +02:00
pci_irq.c PCI/ACPI: Don't cache _PRT, and don't associate them with bus numbers 2013-02-16 11:58:34 -07:00
pci_link.c ACPI: Set length even for TYPE_END_TAG acpi resource 2013-03-24 01:00:38 +01:00
pci_root.c PCI changes for the v3.11 merge window: 2013-07-03 16:31:35 -07:00
pci_slot.c PCI/ACPI: Handle PCI slot devices when creating/destroying PCI buses 2013-04-12 15:38:25 -06:00
power.c ACPI / power: add missing newline to debug messages 2013-07-05 13:30:20 +02:00
proc.c procfs: new helper - PDE_DATA(inode) 2013-04-09 14:13:32 -04:00
processor_core.c acpi: delete __cpuinit usage from all acpi files 2013-07-14 19:36:58 -04:00
processor_driver.c acpi: delete __cpuinit usage from all acpi files 2013-07-14 19:36:58 -04:00
processor_idle.c acpi: delete __cpuinit usage from all acpi files 2013-07-14 19:36:58 -04:00
processor_perflib.c ACPI / processor: Drop unused variable from processor_perflib.c 2013-06-25 23:05:24 +02:00
processor_thermal.c ACPI / processor_thermal: avoid null pointer deference error 2013-03-25 23:01:01 +01:00
processor_throttling.c ACPI: suppress compiler warnings in processor_throttling.c 2013-03-25 00:05:48 +01:00
reboot.c Revert "ACPI: ignore FADT reset-reg-sup flag" 2012-04-20 11:19:35 -07:00
resource.c ACPI / resources: call acpi_get_override_irq() only for legacy IRQ resources 2013-06-19 23:55:59 +02:00
sbs.c proc: Supply a function to remove a proc entry by PDE 2013-05-01 17:29:46 -04:00
sbshc.c ACPI: Remove useless type argument of driver .remove() operation 2013-01-26 00:37:24 +01:00
sbshc.h
scan.c ACPI / scan: Always call acpi_bus_scan() for bus check notifications 2013-07-15 01:26:18 +02:00
sleep.c x86 / ACPI / sleep: Provide registration for acpi_suspend_lowlevel. 2013-06-19 23:36:30 +02:00
sleep.h ACPI: Drop power resources driver 2013-01-17 14:11:06 +01:00
sysfs.c Merge branch 'akpm' (updates from Andrew Morton) 2013-07-03 17:12:13 -07:00
tables.c ACPICA: Cleanup table handler naming conflicts. 2013-01-11 13:10:16 +01:00
thermal.c ACPI / thermal: do not always return THERMAL_TREND_RAISING for active trip points 2013-04-26 13:34:40 +02:00
utils.c ACPI: Add acpi_handle_<level>() interfaces 2012-11-21 23:20:22 +01:00
video.c ACPI video support fixes for 3.11 2013-07-21 10:11:04 -07:00
video_detect.c ACPI / video / i915: No ACPI backlight if firmware expects Windows 8 2013-07-18 02:08:06 +02:00
wakeup.c ACPI / Wakeup: Enable button GPEs unconditionally during initialization 2011-02-12 01:39:53 +01:00