This question already has an answer here:
Here is my system specifications
Processor: Intel Core i7-8700 Processor
GPU: Intel® UHD Graphics 630
OS: Debian 9.6 (Stretch)
Monitor resolution: 1920 x 1084
Even though I have a full HD monitor, I can't set a resolution higher than 1024x768.
The display is labelled as "Unknown Display".
xrandr shows a warning "xrandr: Failed to get size of gamma for output default"
GPU usage is always 0% (Checked using intel-gpu-tools)
Experiencing screen tearing.
When searching online, most of the solution says to enable Jessie backports. Since I am already on stretch, I think I don't have to do it. How am I supposed to solve it, then? does intel provides any drivers?
For those who has the same issue, try this answer as suggested by @Stephen Kitt. It worked for me.