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ACPI / video: Allow forcing native backlight on non win8 machines 

The native backlight behavior (so not registering both the acpi-video
and the vendor backlight driver) can be useful on some non win8 machines
too, so change the behavior of the video.use_native_backlight=1 or 0
kernel cmdline option to be: if user has set video.use_native_backlight=1
or 0, use that no matter if it is a win8 system or not. Also, we will
put some known systems into the DMI table to make them either use native
backlight interface or not, and the use_native_backlight_dmi is used to
reflect that.

Original-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Hans de Goede <hdegoede@redhat.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 2015-03-11 22:09:57 +01:00 committed by Rafael J. Wysocki
parent 9eccca0843
commit ff92cfe7cb
1 changed files with 13 additions and 6 deletions
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19
drivers/acpi/video.c
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@ -82,9 +82,15 @@ module_param(allow_duplicates, bool, 0644);
* For Windows 8 systems: used to decide if video module
* should skip registering backlight interface of its own.
*/
static int use_native_backlight_param = -1;
enum {
NATIVE_BACKLIGHT_NOT_SET = -1,
NATIVE_BACKLIGHT_OFF,
NATIVE_BACKLIGHT_ON,
};
static int use_native_backlight_param = NATIVE_BACKLIGHT_NOT_SET;
module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
static bool use_native_backlight_dmi = true;
static int use_native_backlight_dmi = NATIVE_BACKLIGHT_NOT_SET;
static int register_count;
static struct mutex video_list_lock;
@ -237,15 +243,16 @@ static void acpi_video_switch_brightness(struct work_struct *work);
static bool acpi_video_use_native_backlight(void)
{
if (use_native_backlight_param != -1)
if (use_native_backlight_param != NATIVE_BACKLIGHT_NOT_SET)
return use_native_backlight_param;
else
else if (use_native_backlight_dmi != NATIVE_BACKLIGHT_NOT_SET)
return use_native_backlight_dmi;
return acpi_osi_is_win8();
}
bool acpi_video_verify_backlight_support(void)
{
if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
if (acpi_video_use_native_backlight() &&
backlight_device_registered(BACKLIGHT_RAW))
return false;
return acpi_video_backlight_support();
@ -414,7 +421,7 @@ static int __init video_set_bqc_offset(const struct dmi_system_id *d)
static int __init video_disable_native_backlight(const struct dmi_system_id *d)
{
use_native_backlight_dmi = false;
use_native_backlight_dmi = NATIVE_BACKLIGHT_OFF;
return 0;
}