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Revert "ACPI / video / i915: No ACPI backlight if firmware expects Windows 8"

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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 <[email protected]>
Reported-and-tested-by: Kamal Mostafa <[email protected]>
Reported-and-tested-by: Jörg Otte <[email protected]>
Reported-and-tested-by: Steven Newbury <[email protected]>
Reported-by: Martin Steigerwald <[email protected]>
Reported-by: Kalle Valo <[email protected]>
Tested-by: Joerg Platte <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Rafael J. Wysocki 2013-07-25 21:43:39 +02:00
commit 8e5c2b776a
6 changed files with 11 additions and 87 deletions
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11
include/acpi/video.h
View file

@ -17,21 +17,12 @@ struct acpi_device;
#define ACPI_VIDEO_DISPLAY_LEGACY_TV 0x0200
#if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE)
extern int __acpi_video_register(bool backlight_quirks);
static inline int acpi_video_register(void)
{
return __acpi_video_register(false);
}
static inline int acpi_video_register_with_quirks(void)
{
return __acpi_video_register(true);
}
extern int acpi_video_register(void);
extern void acpi_video_unregister(void);
extern int acpi_video_get_edid(struct acpi_device *device, int type,
int device_id, void **edid);
#else
static inline int acpi_video_register(void) { return 0; }
static inline int acpi_video_register_with_quirks(void) { return 0; }
static inline void acpi_video_unregister(void) { return; }
static inline int acpi_video_get_edid(struct acpi_device *device, int type,
int device_id, void **edid)