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asus-wmi: Disable acpi-video backlight on desktop machines

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Some Asus motherboards for desktop PC-s export an acpi-video interface
advertising backlight support. Test the dmi chassis-type and tell acpi-video
to not register a backlight interface on desktops.

https://bugzilla.redhat.com/show_bug.cgi?id=1097436

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
This commit is contained in:
Hans de Goede 2014-07-08 10:47:21 +02:00 committed by Matthew Garrett
parent ce363c2bcb
commit d8c66f6299
1 changed files with 7 additions and 0 deletions
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7
drivers/platform/x86/asus-wmi.c
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@ -46,6 +46,7 @@
#include <linux/platform_device.h>
#include <linux/thermal.h>
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <acpi/video.h>
#include "asus-wmi.h"
@ -1734,6 +1735,7 @@ static int asus_wmi_add(struct platform_device *pdev)
struct platform_driver *pdrv = to_platform_driver(pdev->dev.driver);
struct asus_wmi_driver *wdrv = to_asus_wmi_driver(pdrv);
struct asus_wmi *asus;
const char *chassis_type;
acpi_status status;
int err;
u32 result;
@ -1770,6 +1772,11 @@ static int asus_wmi_add(struct platform_device *pdev)
if (err)
goto fail_rfkill;
/* Some Asus desktop boards export an acpi-video backlight interface,
stop this from showing up */
chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
if (chassis_type && !strcmp(chassis_type, "3"))
acpi_video_dmi_promote_vendor();
if (asus->driver->quirks->wmi_backlight_power)
acpi_video_dmi_promote_vendor();
if (!acpi_video_backlight_support()) {