https://bugs.freedesktop.org/show_bug.cgi?id=110214
--- Comment #15 from Michel Dänzer michel@daenzer.net --- (In reply to Diego Viola from comment #14)
I can't reproduce the issue if I startx with LIBGL_ALWAYS_SOFTWARE=1.
How exactly did you set that? Normally, I'd expect it to only affect clients, not the X server.
Are you using a compositing manager?