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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-07-25 21:43:39 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-07-26 14:59:20 +0200
commit8e5c2b776ae4c35f54547c017e0a943429f5748a (patch)
treef653dcb55a48408b87224f1515ddb39129a8e9ef /include/linux
parentcpufreq / intel_pstate: Change to scale off of max P-state (diff)
downloadlinux-dev-8e5c2b776ae4c35f54547c017e0a943429f5748a.tar.xz
linux-dev-8e5c2b776ae4c35f54547c017e0a943429f5748a.zip
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>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/acpi.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 6ad72f92469c..353ba256f368 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -191,7 +191,6 @@ extern bool wmi_has_guid(const char *guid);
#define ACPI_VIDEO_BACKLIGHT_DMI_VIDEO 0x0200
#define ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VENDOR 0x0400
#define ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VIDEO 0x0800
-#define ACPI_VIDEO_SKIP_BACKLIGHT 0x1000
#if defined(CONFIG_ACPI_VIDEO) || defined(CONFIG_ACPI_VIDEO_MODULE)