OK, so I have a dual monitor setup via HDMI to my TV, extended screen. Even though the TV has a larger screen, its max resolution is 1280 x 720, whereas my laptop is 1920 x 1080 (pictures attached). This means that my cursor doesn't go to the TV if it's 320 pixels or less from either edge of the laptop's screen because the PC thinks that another screen 'doesn't exist' above that area.
Without lowering the laptop's resolution I want the TV to behave like an equally-wide extension of the laptop's screen. Making the TV 1080 x 1920 causes irritating flicker.
Laptop is Dell L521X, TV is Panasonic TX-32LXD60 if it helps.