[Wayland-bugs] [Bug 81323] weston, when under x11, in sw-render mode, uses lots of processing power

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81323

--- Comment #2 from Pekka Paalanen <ppaalanen at gmail.com> ---
Also, with the DRM backend, you are very likely using the hardware cursor. That
means that just moving the cursor does not need to paint anything. You can
disable that with Win+shift+space then 'c' key sequence for comparison, IIRC.

Under x11, there is no hardware cursor being used, and every cursor position
updates means repainting. Painting in software rendered GL is heavy.

I have no idea what LIBGL_ALWAYS_SOFTWARE does to Weston with the DRM backend,
so please always attach the full output from weston so we see what you are
getting. Weston does not even use libGL, it's a GLESv2 program. You might have
better luck triggering software rendering with EGL environment variables, but
that means that it would fail to put the rendering on screen unless you have
quite new EGL-DRM software rendering support patch set from mesa-devel (I'm not
sure if it was merged yet).

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