Abstract: A method for controlling a damper clutch may include determining whether the damper clutch is in a slip or lock-up state in a driving state of a vehicle, determining whether a condition of the vehicle is within a predetermined resonant range, determining whether a torque of the vehicle is within a predetermined resonant torque range, detecting a subharmonic vibration when the damper clutch is in the slip or lock-up state, the condition of the vehicle is within the predetermined resonant range, and the torque of the vehicle is within the predetermined resonant torque range, and controlling the damper clutch to slip or be open when the subharmonic vibration is larger than a predetermined value.

Abstract: A graphic interface device produces a video signal for a display such that the user may select between landscape and portrait image display modes. The graphic interface device has a pixel data memory array from which a video output signal is derived. A primary graphics engine renders graphics in a landscape orientation in conjunction with a frame buffer. The primary landscape graphics engine stores rendered graphics to the pixel data memory array and also copies selected graphics in data blocks within the frame buffer called surfaces. In order to provide other display modes to display images in different physical orientations, a mode control is provided in conjunction with a rotated pixel data array buffer to facilitate the rendering of portrait oriented graphics by the primary landscape graphics engine. In addition, to facilitate the efficiency and speed of rendering portrait oriented graphics, a secondary portrait graphics engine is provided.