Windows 10: How do I fix my laptop's LCD input lag? External monitors are not affected by this lag

I have a Dell Latitude 9410 on windows 11 23H2 set to 60hz refresh rate and there is a noticable input lag which affects my gameplay in games that I play on the laptop. The problem has never gone away with whatever monitor configuration I tried. So as a test I used an external monitor also set to 60hz and the difference in lag was apparent check attached image, bottom is laptop, top is external monitor. As seen, laptop's display is behind by many pixels than the external monitor. I've tried installing latest intel GPU drivers, updating to latest windows version but not 24H2 because... wel

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Mouse lag when laptop is hooked up to an external monitor

I have Asus laptop. I tried to reinstall mouse drivers with no result.

My mouse is lagging on built in display when I have connected external monitor through hdmi. Mouse is lagging only over windows desktop. Mouse is NOT lagging when it is over any window.

I have 4k display (build in), but I am using only full HD resolution. External monitor is only full HD.

EDIT: I find out that even video on that screen is lagging when I move mouse over desktop.

 

x1900xtx input lag

Ok I have the same issues with the input lag when using ati tool and the dynamic fan control. I only use ati tool for this feature so my question is this: does the latest version address this issue and if not, can I control the fan speed a different way that wont cause the stupid input lag? The x1900xtx get HOT and I like ati tool, but it is hard to play css when you have input lag for 3-4 seconds every 2 minutes. Please help me ASAP. Does .26 version fix this or what are some suggestions that might eliminate the input lag but still be able to use this great tool? Thanks! Does anyone know if ati tray tool works better in this department?

 

Input lag?

• So I had to install the last fall creator's update because of mandatory security updates. Sometimes I launch tf2 and there's major input lag while other times there isn't. I used to have a solution of reverting to a version before the fall creators update
  but I've tried that recently and I needed to reinstall Windows 10. Another solution was to just restart but I don't want to have to restart my laptop every time I want to play video games. I don't know what's causing the input lag, whether it's because of
  the game or the OS or Logitech Gaming Software (which might not be the issue since I had this issue way before I ever got a logitech mouse). I suspect it's the OS and the fall creator's update. I need a permanent solution to stop this input lag. If anyone
  has one, I would really appreciate it.