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| author | Hans de Goede <hdegoede@redhat.com> | 2014-08-28 10:20:46 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-09-02 01:53:44 +0200 |
| commit | 5f24079b021cd3147c8d24ba65833f7a0df7e80d (patch) | |
| tree | e368e031c6bdc05baea45ce8c576b3c512d58c7c | |
| parent | 25294e9f00f03b2b4f4c56e913bc8c573972f33b (diff) | |
| download | linux-5f24079b021cd3147c8d24ba65833f7a0df7e80d.tar.bz2 | |
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>
| -rw-r--r-- | drivers/acpi/video.c | 30 |
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"), + }, + }, {} }; |