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    Subject[PATCH 4.14 068/125] ACPI: video: use ACPI backlight for HP 635 Notebook
    Date
    From: Alex Hung <alex.hung@canonical.com>

    commit b226faab4e7890bbbccdf794e8b94276414f9058 upstream.

    The default backlight interface is AMD's radeon_bl0 which does not
    work on this system, so use the ACPI backlight interface on it
    instead.

    BugLink: https://bugs.launchpad.net/bugs/1894667
    Cc: All applicable <stable@vger.kernel.org>
    Signed-off-by: Alex Hung <alex.hung@canonical.com>
    [ rjw: Changelog edits ]
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/acpi/video_detect.c | 9 +++++++++
    1 file changed, 9 insertions(+)

    --- a/drivers/acpi/video_detect.c
    +++ b/drivers/acpi/video_detect.c
    @@ -274,6 +274,15 @@ static const struct dmi_system_id video_
    DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
    },
    },
    + /* https://bugs.launchpad.net/bugs/1894667 */
    + {
    + .callback = video_detect_force_video,
    + .ident = "HP 635 Notebook",
    + .matches = {
    + DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
    + DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
    + },
    + },

    /* Non win8 machines which need native backlight nevertheless */
    {

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