From 135e41aad4ac9b64b60a96a2a5072dba846161c1 Mon Sep 17 00:00:00 2001 From: Brad Figg Date: Wed, 28 Mar 2012 11:18:50 -0700 Subject: [PATCH] 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 --- 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 eae12b6..42b226e0 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -73,6 +73,14 @@ static int 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 */ @@ -1421,7 +1429,7 @@ 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) -- 1.7.9.1