diff options
| author | Brad Figg <brad.figg@canonical.com> | 2012-03-29 08:53:11 -0700 |
|---|---|---|
| committer | John Rigby <john.rigby@linaro.org> | 2012-06-25 15:02:23 -0600 |
| commit | 437250f1d8d062296cf37fc994bd2ed5e1b0cac1 (patch) | |
| tree | 385b8f247359b4c81760c3e434b96458e7c93e68 | |
| parent | a4f27db0fb56bfcff76fd698ca4d8d4b76898a29 (diff) | |
UBUNTU: SAUCE (no-up) Provide a param for allowing the BIOS to handle changing the brightness on AC/battery status changes.
BugLink: http://bugs.launchpad.net/bugs/949311
We currently carry a SAUCE patch which lets the OS handle the brightness
levels automatically when connecting/disconnecting AC. There are some
laptops (MSI Wind) for which this doesn't work. Provide a driver param
which allows this behaviour to be overriden.
Signed-off-by: Brad Figg <brad.figg@canonical.com>
Acked-by: Colin King <colin.king@canonical.com>
Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>
| -rw-r--r-- | drivers/acpi/video.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index 9006942eacb..e58b53c86ae 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -73,6 +73,14 @@ static bool brightness_switch_enabled = 1; module_param(brightness_switch_enabled, bool, 0644); /* + * The Default is to let the OS handle brightness autoswitching due to + * AC/battery status changes. On some laptops (MSI Wind) this doesn't + * work so we need a workaround. + */ +static int brightness_autoswitch_via_bios = 0; +module_param(brightness_autoswitch_via_bios, bool, 0644); + +/* * By default, we don't allow duplicate ACPI video bus devices * under the same VGA controller */ @@ -1423,7 +1431,7 @@ static int acpi_video_bus_put_devices(struct acpi_video_bus *video) static int acpi_video_bus_start_devices(struct acpi_video_bus *video) { - return acpi_video_bus_DOS(video, 0, 1); + return acpi_video_bus_DOS(video, 0, !brightness_autoswitch_via_bios); } static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) |