Desktop template app running on embedded Linux: high CPU usage (framebuffer display, linux-arm)

[ps3681]

Describe the bug

[I am a complete Avalonia newbie here, evaluating Avalonia vs. Qt for an embedded Linux UI project.]

When running the VS template desktop app "Welcome to Avalonia!" modified for framebuffer display (StartLinuxFbDev) on my SBC (Digi ConnectCore with yacto build), top shows high CPU usage (~30%) for an otherwise completely idle app.

To Reproduce

Modify the VS desktop template Main method line:
return builder.StartLinuxDrm(args: args, card: null, scaling: 1.0);
to:
return builder.StartLinuxFbDev(new string[] { "--fbdev" }, "/dev/fb0", 1, new LibInputBackend());
Include the LinuxFramebuffer package reference, if necessary, in the Desktop .csproj file
build and publish for .net8, self-contained, linux-arm in VS2022 on Windows 10.
Copy the published files to the SBC, chmod +x the desktop app and run.

Expected behavior

I would expect the CPU to be at or near 0% usage.

Avalonia version

11.1.3

OS

Linux

Additional context

No response