[solved]
I've read some of the other posts here and other places regarding this, but they did not help me yet. I have severe input lag for my external (4k) monitor.
Some facts:
- Running Ubuntu 22.04.2 LTS
- Using laptop with external screen in "extend" mode
- Using X11, since Wayland isn't compatible with my Nvidia GPU
- I have an AMD CPU
- Input lag can be SEVERAL SECONDS for the external monitor.
- External monitor is connected by HDMI 1.0 cable.
Let's say I open a terminal on laptop monitor, all is fine. Then I move the window to the external screen - laaaagg. Then I move the window back to the laptop screen, and all is fine again.
It was working fine. And then I needed to install some Python packages, and suddenly I can't use an external monitor anymore. I don't remember which packages; some of them were Nvidia CUDA related.
On the external monitor, whenever input lag is observed, I can simply move the mouse to "refresh" the input or something. The point is: If it's slow and I move the mouse, then I get the input shown on screen, and then it's slow again. So I have to constantly move the mouse across the screen.
If I go to Ubuntu Settings -> About, then under "Graphics" it says:
NVIDIA Corporation / REMBRANDT (rembrandt, LLVM 15.0.6, DRM 3.47, 5.19.0-35-generic). So clearly it's not only using Nvidia, which might be part of the issue, but again this issue was not present from the start.
- Why is this related to the mouse movement?
- How did this issue just occur after installing some random Python
packages?
- Can I do something constructive about it, rather than deleting Python completely (if that's even possible) or just buying a new computer? The AMD CPU is constantly a pain to work with, and this is just one of many issues that I've had to deal with.
