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authorHans de Goede <hdegoede@redhat.com>2014-08-28 12:20:46 +0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-09-02 03:53:44 +0400
commit5f24079b021cd3147c8d24ba65833f7a0df7e80d (patch)
treee368e031c6bdc05baea45ce8c576b3c512d58c7c /drivers
parent25294e9f00f03b2b4f4c56e913bc8c573972f33b (diff)
downloadlinux-5f24079b021cd3147c8d24ba65833f7a0df7e80d.tar.xz
ACPI / video: Add a disable_native_backlight quirk
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@web.de> Cc: 3.16+ <stable@vger.kernel.org> # 3.16+ Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/acpi/video.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 58bcf7af3ac8..dd5c30257b86 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -417,6 +417,12 @@ static int __init video_set_use_native_backlight(const struct dmi_system_id *d)
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
@@ -720,6 +726,30 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
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"),
+ },
+ },
{}
};