Hej Marco---

Thanks for your reply. I tried to send the cygcheck output to the Cygwin mailing list last week, but the file was too big (2M) and the post was rejected. I therefore put the file on a temporary platform for file exchange:
http://exporter.nsc.liu.se/2ce844aaa0014c9f9cf889f2b062fdc7/cygcheck.out
from where you should be able to fetch it.

I tried to repeat exactly the example that you suggested, no success unfortunately. I attach the XWin logfile, maybe it helps you to spot anything.

Best wishes,
Klaus



> -----Ursprungligt meddelande-----
> Från: marco atzeri <marco.atzeri@gmail.com>
> Skickat: den 12 januari 2023 16:19
> Till: Wyser Klaus <Klaus.Wyser@smhi.se>
> Kopia: cygwin@cygwin.com
> Ämne: Re: octave doesn't work any longer with qt graphics toolkit
> 
> On Thu, Jan 12, 2023 at 3:32 PM Wyser Klaus via Cygwin  wrote:
> >
> > Hej---
> >
> > I got a new computer in September and installed Cygwin/X11 and many
> > more packages, among others Octave (I think it was 5.2 back then). I have
> been using cygwin and octave for 20 years already, so I'm not new to this.
> Well, everything worked just fine until I happened to update some cygwin
> packages in December, among others octave (to version 6.4). Unfortunately I
> didn't pay attention to what else was updated in that go, usually these
> regular updates (marked as "pending" in the setup) just work fine. Not this
> time though: octave is still working, but not the graphics output. When
> entering a command to plot something a figure window opens under X11,
> but it is just a copy of the background and doesn't show what I wanted to
> plot. Octave doesn't freeze, I can still work and do all the math stuff, it's just
> the plotting that doesn't work any longer. After some troubleshooting I
> found that it likely is a problem with the graphics_toolkit, I can make plots if I
> set it to "gnuplot" but get th  e problem when it is set to "qt" (which is the
> default).
> >
> > So should I use "gnuplot" then? Well, that's not really an option because
> gnuplot doesn't allow interaction with the figure (rotating, zooming), and
> some of the more complicated plotting routines don't work properly any
> more (e.g. contour plots).
> >
> > First I suspected this being a problem of the Octave update, but apparently
> it's not the case. Even when going back to Octave 5.2 I still have the same
> problem with the figure window. Searching the Internet didn't help, so I
> wonder if I'm the only one having this problem with Octave? As said above, I
> don't know exactly what other Cygwin packages have been updated at the
> same time, so in principle it is possible that there is an incompatibility with
> some other packages (OpenGL?) that were updated at the same time, I tried
> reverting some libraries but it didn't help. I also tried to isolate the problem
> by installing a very limited Cygwin setup from scratch, basically only X11 and
> Octave, nothing else. I get the exact same error even with this very restricted
> setup.
> >
> > When searching for help I also came across this page:
> https://wiki.octave.org/Octave_for_Microsoft_Windows There is a Windows
> version of Octave that can be installed independently from Cygwin (relying
> on mingw64 in my case) and that installation works well (including graphics).
> This is also a newer version of Octave (7.3) compared to the Cygwin package
> (6.4). The Windows installation is a fallback option, however, I cannot
> integrate it with my Cygwin environment which makes my workflows way
> more complicated and I would prefer to have an Octave package for Cygwin.
> >
> > So my questions are:
> > - Am I the only one in the Cygwin/X11 community with this kind of Octave
> problem?
> > - Is there something I can do about it (OpenGL/Qt...)?
> > - Will there soon be a new Octave 7 release for Cygwin that hopefully
> solves all my problems?
> >
> > Any help is greatly appreciated, thanks.
> >
> > =====
> > Klaus Wyser
> > Rossby Centre
> > SMHI
> >
> 
> Hi Klaus,
> 
> the following works for me
> 
>  graphics_toolkit("qt")
>  x=1:10;
>  plot(x,x)
> 
> can you provide your cygcheck.out as attachment ?
> 
> see https://cygwin.com/problems.html
> 
> About Octave 7, I am currently not very active on updating any package so do
> not expect anything short term.
> 
> Regards
> Marco