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From: Len Brown <lenb@kernel.org>
To: linux-acpi@vger.kernel.org, linux-pm@lists.linux-foundation.org
Cc: linux-kernel@vger.kernel.org, Zhang Rui <rui.zhang@intel.com>,
	Igor Murzov <intergalactic.anonymous@gmail.com>,
	stable@vger.kernel.org, Len Brown <len.brown@intel.com>
Subject: [PATCH 7/8] ACPI video: Still use ACPI backlight control if _DOS doesn't exist
Date: Sat, 30 Jun 2012 01:07:34 -0400	[thread overview]
Message-ID: <b03738430c7537d5f87948e0b35d8aaf2688c6b4.1341032550.git.len.brown@intel.com> (raw)
In-Reply-To: <1341032855-27139-1-git-send-email-lenb@kernel.org>
In-Reply-To: <9f132652d94c96476b0b0a8caf0c10e96ab10fa8.1341032550.git.len.brown@intel.com>

From: Zhang Rui <rui.zhang@intel.com>

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 <intergalactic.anonymous@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---
 drivers/acpi/video.c | 2 ++
 1 file changed, 2 insertions(+)

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;
-- 
1.7.11.1.104.ge7b44f1

  parent reply	other threads:[~2012-06-30  5:07 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-06-30  5:07 ACPI & Power Management Patches for Linux 3.5-rc4 Len Brown
2012-06-30  5:07 ` [PATCH 1/8] ACPI sysfs.c strlen fix Len Brown
2012-06-30  5:07   ` [PATCH 2/8] ACPI, x86: fix Dell M6600 ACPI reboot regression via DMI Len Brown
2012-06-30  5:07     ` Len Brown
2012-07-06 11:09     ` Ingo Molnar
2012-06-30  5:07   ` [PATCH 3/8] ACPI: Make acpi_skip_timer_override cover all source_irq==0 cases Len Brown
2012-06-30  5:07     ` Len Brown
2012-06-30  5:07   ` [PATCH 4/8] ACPI: Remove one board specific WARN when ignoring timer overriding Len Brown
2012-06-30  5:07     ` Len Brown
2012-06-30  5:07   ` [PATCH 5/8] ACPI: Add a quirk for "AMILO PRO V2030" to ignore the " Len Brown
2012-06-30  5:07     ` Len Brown
2012-06-30  5:07   ` [PATCH 6/8] ACPI, APEI, Avoid too much error reporting in runtime Len Brown
2012-06-30  5:07     ` Len Brown
2012-06-30  5:07   ` Len Brown [this message]
2012-06-30  5:07   ` [PATCH 8/8] acpi_pad: fix power_saving thread deadlock Len Brown
2012-06-30  5:07     ` Len Brown
2012-06-30 14:25   ` [PATCH 1/8] ACPI sysfs.c strlen fix Alan Stern
2012-06-30 14:25     ` [linux-pm] " Alan Stern
2012-07-27  1:39     ` [PATCH] ACPI: replace strlen("string") with sizeof("string") -1 Len Brown
2012-07-27  1:39       ` Len Brown
2012-07-30 14:26       ` Ian Campbell
2012-07-30 14:41         ` richard -rw- weinberger
2012-08-06 10:21       ` [linux-pm] " Pavel Machek
2012-08-06 14:36         ` Alan Stern
2012-08-06 14:36           ` [linux-pm] " Alan Stern
2012-08-06 16:00           ` Pavel Vasilyev
2012-08-06 16:28             ` Alan Stern
2012-08-06 16:28               ` [linux-pm] " Alan Stern
2012-08-06 18:47               ` Pavel Vasilyev
2012-08-06 19:59                 ` Alan Stern
2012-08-06 19:59                   ` [linux-pm] " Alan Stern
2012-08-06 22:57                   ` Daniel Taylor
2012-08-06 22:57                     ` Daniel Taylor
2012-08-07 13:19                     ` Bernd Petrovitsch
2012-08-07 13:19                       ` [linux-pm] " Bernd Petrovitsch
2012-08-08  0:59                       ` Daniel Taylor
2012-08-08  0:59                         ` Daniel Taylor
2012-08-07  1:07                   ` Pavel Vasilyev
2012-08-07  1:07                     ` Pavel Vasilyev
2012-08-07 17:24                     ` Alan Stern
2012-08-07 17:24                       ` [linux-pm] " Alan Stern
2012-08-07 23:23                       ` Pavel Vasilyev
2012-08-08  1:27                         ` Alan Stern
2012-08-08  1:27                           ` Alan Stern
2012-08-06 10:26       ` Andreas Schwab

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