[Octave-bug-tracker] [bug #52260] Axes appear upside down with Qt5

[Rik]

Follow-up Comment #12, bug #52260 (project octave):

By all means, try Dan's patch and see if there is something more to discover. 
But, the simplest conclusion is that there *is* something wrong with the
HW-accelerated implementation of OpenGL that you have.  In that case, the
easiest workaround is to rely on software rendering of OpenGL which tends to
be more accurate, but slower.

See this comment which I wrote for bug #52266 which is another HW/SW problem

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I don't think it would be bad to set LIBGL_ALWAYS_SOFTWARE=1 permanently. You
would be choosing software over hardware rendering on a permanent basis. The
advantage is that the software-rendering engine is implementing the OpenGL
specification more accurately than the hardware-rendering engine. The
disadvantage would be performance. For most Octave plots, that shouldn't be a
big deal, but if you have an application, maybe gaming or possibly CAD, that
needs to draw a lot of polygons then it might be a problem. Of course, you
could always arrange to either set LIBGL_ALWAYS_SOFTWARE only before running
Octave. Or you could go the other way and unset the environment variable
before running your graphics-intensive software.

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