I have a weird issue with sluggish opengl on part of a screen on debian unstable. I noticed it using Kitty terminal, and confirmed it with glxgears. I use a dualscreen setup and glxgears FPS drops when moving the window to a certain portion of the screen.
Hardware setup:
- Dell XPS13 9360, with a 4K screen (3800x1800), 276dpi on eDP-1
Asus HD screen connected through thunderbolt. (1920x1080), 96 dpi. on DP-1
I use this xrandr command to setup the two screens:
Code: Select all
xrandr --output DP-1 --scale 2x2 --fb 7040x2160 --pos 0x0 --left-of eDP-1 --mode 1920x1080; xrandr --output eDP-1 --pos 3840x0 --dpi 276.05x276.05
I don't know where to start looking for clues on the issue, as I'm not an expert in Xorg and DRI.
Any suggestion are welcome. And if you need more info, please ask.
Thanks,
nab