It doesn't detect my monitor as a monitor

Hey i have bought new monitor since my old one sometimes work , sometimes doesn't.When i plugged in my new monitor which is LG TV 24MS53S Smart monitor the mouse has unnatural movements they sluggish and slow and hard to control same whit my tablet.After 2 days i noticed that under Device manager under Monitors it says Generic PnP monitor which is the monitor of my laptop (lenovo y510p) if i am not mistaken.While my monitor is under Audio inputs and outputs as LG TV-C NVIDIA High Definition Audio.I dont know if that what the problems is but i need help to fix my mouse.Also my monitor is connected via HDMI and also when i connect my mouse directly to my monitor it works fine but it can only be used for TV and apps, etc.

The audio is referring to the audio signal for the TV. I want to make sure I understand you correctly, you are using the external monitor (LG) as your primary display, not dual monitors...?

If this is the case, go back into Device Manager, rt.click the Generic Monitor and choose "Update device driver". As long as the LG monitor is the primary display, and your laptop screen is off, 'Generic Monitor' is referring to whichever monitor is active. If you are using both monitors, then you should have two monitors being shown in device manager.

As far as the mouse feeling 'sluggish', do you mean it's just very slow? What is the screen resolution of your new LG monitor? Is it the same as the laptop monitor? If the resolution is higher, sometimes the mouse will seem sluggish when using a higher resolution, which means you might have to turn up the pointer speed in the mouse's control panel. Before you update the device drivers for the monitor (which may or may not be able to be updated), try reducing the screen resolution of the LG and test the mouse that way.