This is a note to let you know that I've just added the patch titled
ACPI video: Still use ACPI backlight control if _DOS doesn't exist
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
acpi-video-still-use-acpi-backlight-control-if-_dos-doesn-t-exist.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From b03738430c7537d5f87948e0b35d8aaf2688c6b4 Mon Sep 17 00:00:00 2001
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
From: Zhang Rui <[email protected]>
commit b03738430c7537d5f87948e0b35d8aaf2688c6b4 upstream.
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]>
Signed-off-by: Zhang Rui <[email protected]>
Signed-off-by: Len Brown <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/acpi/video.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -558,6 +558,8 @@ acpi_video_bus_DOS(struct acpi_video_bus
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;
Patches currently in stable-queue which might be from [email protected] are
queue-3.4/acpi-video-still-use-acpi-backlight-control-if-_dos-doesn-t-exist.patch
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