This is a note to let you know that I've just added the patch titled
ACPI / video: Add a disable_native_backlight quirk
to the 3.16-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-add-a-disable_native_backlight-quirk.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5f24079b021cd3147c8d24ba65833f7a0df7e80d Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@xxxxxxxxxx>
Date: Thu, 28 Aug 2014 10:20:46 +0200
Subject: ACPI / video: Add a disable_native_backlight quirk
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From: Hans de Goede <hdegoede@xxxxxxxxxx>
commit 5f24079b021cd3147c8d24ba65833f7a0df7e80d upstream.
Some laptops have a working acpi_video backlight control, and using native
backlight on these causes a regression where backlight control does not work
when userspace is not handling brightness key events. Disable native_backlight
on these to fix this.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=81691
Reported-and-tested-by: Andre Müller <andre.muller@xxxxxx>
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/acpi/video.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -415,6 +415,12 @@ static int __init video_set_use_native_b
return 0;
}
+static int __init video_disable_native_backlight(const struct dmi_system_id *d)
+{
+ use_native_backlight_dmi = false;
+ return 0;
+}
+
static struct dmi_system_id video_dmi_table[] __initdata = {
/*
* Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
@@ -645,6 +651,30 @@ static struct dmi_system_id video_dmi_ta
DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
},
},
+
+ /*
+ * These models have a working acpi_video backlight control, and using
+ * native backlight causes a regression where backlight does not work
+ * when userspace is not handling brightness key events. Disable
+ * native_backlight on these to fix this:
+ * https://bugzilla.kernel.org/show_bug.cgi?id=81691
+ */
+ {
+ .callback = video_disable_native_backlight,
+ .ident = "ThinkPad T420",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
+ },
+ },
+ {
+ .callback = video_disable_native_backlight,
+ .ident = "ThinkPad T520",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
+ },
+ },
{}
};
Patches currently in stable-queue which might be from hdegoede@xxxxxxxxxx are
queue-3.16/acpi-video-disable-native_backlight-on-hp-envy-15-notebook-pc.patch
queue-3.16/acpi-video-fix-use_native_backlight-selection-logic.patch
queue-3.16/acpi-video-add-a-disable_native_backlight-quirk.patch
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