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ACPI / video: update condition to check if device is in _DOD list 

Commit 0b8db271f1 ("ACPI / video: check _DOD list when creating
backlight devices") checks if the video device is in the bind devices
list to decide if we should create backlight device for it, that causes
problem for one Dell Latitude E6410, where none of the video output
devices are properly bound due to the way how we did the comparing
between its _ADR and the _DOD's values. Solve this problem by comparing
the lower 12 bits of both the device's _ADR and the _DOD's values instead
of relying on bind result.

Fixes: 0b8db271f1 ("ACPI / video: check _DOD list when creating backlight devices")
Reported-and-tested-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Aaron Lu 2014-12-01 02:09:18 +01:00 committed by Rafael J. Wysocki
parent 009d0431c3
commit 35d0565b95
1 changed files with 2 additions and 1 deletions
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3
drivers/acpi/video.c
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@ -1164,7 +1164,8 @@ static bool acpi_video_device_in_dod(struct acpi_video_device *device)
return true;
for (i = 0; i < video->attached_count; i++) {
if (video->attached_array[i].bind_info == device)
if ((video->attached_array[i].value.int_val & 0xfff) ==
(device->device_id & 0xfff))
return true;
}