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| author | Aaron Lu <aaron.lu@intel.com> | 2014-12-15 16:01:29 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-12-15 15:24:23 +0100 |
| commit | b4df463678fb9c6dae9548dbb7545993779fd416 (patch) | |
| tree | ec7f40a4895dc5b23ab7b6b098a01398b2ec4236 /drivers/acpi/video.c | |
| parent | 667ae4ee6c29c7ea261d53d3ecc016026d9c2a9a (diff) | |
| download | linux-b4df463678fb9c6dae9548dbb7545993779fd416.tar.gz linux-b4df463678fb9c6dae9548dbb7545993779fd416.tar.bz2 linux-b4df463678fb9c6dae9548dbb7545993779fd416.zip | |
ACPI / video: update the skip case for acpi_video_device_in_dod()
If the firmware has declared more than 8 video output devices, and the
one that control the internal panel's backlight is listed after the
first 8 output devices, the _DOD will not include it due to the current
i915 operation region implementation. As a result, we will not create a
backlight device for it while we should. Solve this problem by special
case the firmware that has 8+ output devices in that if we see such a
firmware, we do not test if the device is in _DOD list. The creation of
the backlight device will also enable the firmware to emit events on
backlight hotkey press when the acpi_osi= cmdline option is specified on
those affected ASUS laptops.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=70241
Reported-and-tested-by: Oleksij Rempel <linux@rempel-privat.de>
Reported-and-tested-by: Dmitry Tunin <hanipouspilot@gmail.com>
Reported-and-tested-by: Jimbo <jaime.91@hotmail.es>
Cc: 3.18+ <stable@vger.kernel.org> # 3.18+
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 'drivers/acpi/video.c')
| -rw-r--r-- | drivers/acpi/video.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index 185a57d13723..1eaadff2e198 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -155,6 +155,7 @@ struct acpi_video_bus { u8 dos_setting; struct acpi_video_enumerated_device *attached_array; u8 attached_count; + u8 child_count; struct acpi_video_bus_cap cap; struct acpi_video_bus_flags flags; struct list_head video_device_list; @@ -1159,8 +1160,12 @@ static bool acpi_video_device_in_dod(struct acpi_video_device *device) struct acpi_video_bus *video = device->video; int i; - /* If we have a broken _DOD, no need to test */ - if (!video->attached_count) + /* + * If we have a broken _DOD or we have more than 8 output devices + * under the graphics controller node that we can't proper deal with + * in the operation region code currently, no need to test. + */ + if (!video->attached_count || video->child_count > 8) return true; for (i = 0; i < video->attached_count; i++) { @@ -1413,6 +1418,7 @@ acpi_video_bus_get_devices(struct acpi_video_bus *video, dev_err(&dev->dev, "Can't attach device\n"); break; } + video->child_count++; } return status; } |