commit: b03738430c7537d5f87948e0b35d8aaf2688c6b4 From: Zhang Rui <[email protected]> Date: Wed, 20 Jun 2012 09:48:43 +0800 Subject: ACPI video: Still use ACPI backlight control if _DOS doesn't exist
This fixes a regression in 3.4-rc1 caused by commit ea9f8856bd6d4ed45885b06a338f7362cd6c60e5 (ACPI video: Harden video bus adding.) Some platforms don't have _DOS control method, but the ACPI backlight still works. We should not invoke _DOS for these platforms. https://bugzilla.kernel.org/show_bug.cgi?id=43168 Cc: Igor Murzov <[email protected]> Cc: [email protected] Signed-off-by: Zhang Rui <[email protected]> Signed-off-by: Len Brown <[email protected]> --- drivers/acpi/video.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index 9577b6f..4134b30 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -558,6 +558,8 @@ acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) union acpi_object arg0 = { ACPI_TYPE_INTEGER }; struct acpi_object_list args = { 1, &arg0 }; + if (!video->cap._DOS) + return 0; if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) return -EINVAL; -- 1.7.3.4 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
