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authorAaron Lu <aaron.lu@intel.com>2014-07-07 15:43:51 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-07-07 23:38:05 +0200
commit0b9f7d93ca6109048a4eb06332b666b6e29df4fe (patch)
treedafe5099689b7a18e12ef1cf98ecafd89ab52235 /include
parentcd3de83f147601356395b57a8673e9c5ff1e59d1 (diff)
ACPI / i915: ignore firmware requests for backlight change
Some Thinkpad laptops' firmware will initiate a backlight level change request through operation region on the events of AC plug/unplug, but since we are not using firmware's interface to do the backlight setting on these affected laptops, we do not want the firmware to use some arbitrary value from its ASL variable to set the backlight level on AC plug/unplug either. Link: https://bugzilla.kernel.org/show_bug.cgi?id=76491 Link: https://bugzilla.kernel.org/show_bug.cgi?id=77091 Reported-and-tested-by: Igor Gnatenko <i.gnatenko.brain@gmail.com> Reported-and-tested-by: Anton Gubarkov <anton.gubarkov@gmail.com> Signed-off-by: Aaron Lu <aaron.lu@intel.com> Acked-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include')
-rw-r--r--include/acpi/video.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/acpi/video.h b/include/acpi/video.h
index ea4c7bbded4d..843ef1adfbfa 100644
--- a/include/acpi/video.h
+++ b/include/acpi/video.h
@@ -22,6 +22,7 @@ extern void acpi_video_unregister(void);
extern void acpi_video_unregister_backlight(void);
extern int acpi_video_get_edid(struct acpi_device *device, int type,
int device_id, void **edid);
+extern bool acpi_video_verify_backlight_support(void);
#else
static inline int acpi_video_register(void) { return 0; }
static inline void acpi_video_unregister(void) { return; }
@@ -31,6 +32,7 @@ static inline int acpi_video_get_edid(struct acpi_device *device, int type,
{
return -ENODEV;
}
+static inline bool acpi_video_verify_backlight_support(void) { return false; }
#endif
#endif

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