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    Subject[PATCH 3.15 61/84] drm/i915: Acer C720 and C720P have controllable backlights
    Date
    3.15-stable review patch.  If anyone has any objections, please let me know.

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

    From: Scot Doyle <lkml14@scotdoyle.com>

    commit 2e93a1aa9ca455aa3ad0294bcd6d66f38bf8b758 upstream.

    The Acer C720 and C720P Chromebooks (with Celeron 2955U CPU) have a
    controllable backlight although their VBT reports otherwise. Apply quirk
    to ignore the backlight presence check during backlight setup.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79813
    Tested-by: James Duley <jagduley@gmail.com>
    Tested-by: Michael Mullin <masmullin@gmail.com>
    Signed-off-by: Scot Doyle <lkml14@scotdoyle.com>
    CC: Jani Nikula <jani.nikula@intel.com>
    Signed-off-by: Jani Nikula <jani.nikula@intel.com>
    [danvet: Add cc: stable because the regressing commit is in 3.15.]
    Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/i915/intel_display.c | 3 +++
    1 file changed, 3 insertions(+)

    --- a/drivers/gpu/drm/i915/intel_display.c
    +++ b/drivers/gpu/drm/i915/intel_display.c
    @@ -11245,6 +11245,9 @@ static struct intel_quirk intel_quirks[]

    /* Acer Aspire 5336 */
    { 0x2a42, 0x1025, 0x048a, quirk_invert_brightness },
    +
    + /* Acer C720 and C720P Chromebooks (Celeron 2955U) have backlights */
    + { 0x0a06, 0x1025, 0x0a11, quirk_backlight_present },
    };

    static void intel_init_quirks(struct drm_device *dev)



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