Bug summary

When rendering a plot on Wayland with fractional scaling turned on (e.g., 150%), the resulting plot content looks bad (i.e., jagged edges in lines and text). The UI is fine though (i.e., the toolbar looks nice and sharp).

Code for reproduction

importmatplotlibmatplotlib.use("qtagg")importmatplotlib.pyplotaspltplt.plot([1,10,-3,17,0,-6,2,12,18,-3])plt.show()

Actual outcome

Expected outcome

I would expect the plot to render nicely.

Additional information

Maybe there is something wrong with detecting the actual DPI when fractional scaling is enabled? I also noticed that when creating the figure with 100% and then switching to 150% scaling in my desktop environment (I'm using GNOME), the figure remains sharp (i.e., plot elements are anti-aliased). It's only when I create the figure from 150% scaling that it is jagged. (I use a 4K screen with 150% fractional scaling.)

Operating system

Arch Linux

Matplotlib Version

3.10.3

Matplotlib Backend

qtagg

Python version

3.13.5

Jupyter version

No response

Installation

None