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| author |   Aaron Lu <aaron.lu@intel.com> | 2014-07-07 15:43:51 +0800 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-07-07 23:38:05 +0200 |
| commit | 0b9f7d93ca6109048a4eb06332b666b6e29df4fe (patch) | |
| tree | dafe5099689b7a18e12ef1cf98ecafd89ab52235 /include/acpi | |
| parent | Linux 3.16-rc4 (diff) | |
| download | linux-dev-0b9f7d93ca6109048a4eb06332b666b6e29df4fe.tar.xz linux-dev-0b9f7d93ca6109048a4eb06332b666b6e29df4fe.zip | |
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/acpi')
| -rw-r--r-- | include/acpi/video.h | 2 |
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 |