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    Subject[PATCH 3.4 123/177] acer-wmi: Add acpi_backlight=video quirk for the Acer KAV80
    Date
    From: Hans de Goede <hdegoede@redhat.com>

    3.4.106-rc1 review patch. If anyone has any objections, please let me know.

    ------------------


    commit 183fd8fcd7f8afb7ac5ec68f83194872f9fecc84 upstream.

    The acpi-video backlight interface on the Acer KAV80 is broken, and worse
    it causes the entire machine to slow down significantly after a suspend/resume.

    Blacklist it, and use the acer-wmi backlight interface instead. Note that
    the KAV80 is somewhat unique in that it is the only Acer model where we
    fall back to acer-wmi after blacklisting, rather then using the native
    (e.g. intel) backlight driver. This is done because there is no native
    backlight interface on this model.

    BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1128309
    Signed-off-by: Hans de Goede <hdegoede@redhat.com>
    Signed-off-by: Darren Hart <dvhart@linux.intel.com>
    Signed-off-by: Zefan Li <lizefan@huawei.com>
    ---
    drivers/platform/x86/acer-wmi.c | 11 +++++++++++
    1 file changed, 11 insertions(+)

    diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
    index c1a3fd8..4d04731 100644
    --- a/drivers/platform/x86/acer-wmi.c
    +++ b/drivers/platform/x86/acer-wmi.c
    @@ -523,6 +523,17 @@ static const struct dmi_system_id video_vendor_dmi_table[] = {
    DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
    },
    },
    + {
    + /*
    + * Note no video_set_backlight_video_vendor, we must use the
    + * acer interface, as there is no native backlight interface.
    + */
    + .ident = "Acer KAV80",
    + .matches = {
    + DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
    + DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
    + },
    + },
    {}
    };

    --
    1.9.1


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