3.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Scot Doyle <lkml14@xxxxxxxxxxxxx> 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@xxxxxxxxx> Tested-by: Michael Mullin <masmullin@xxxxxxxxx> Signed-off-by: Scot Doyle <lkml14@xxxxxxxxxxxxx> CC: Jani Nikula <jani.nikula@xxxxxxxxx> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> [danvet: Add cc: stable because the regressing commit is in 3.15.] Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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) -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html