bugGNU Octave - Bugs: bug #55582, plot does appear on qt...


bug #55582: plot does appear on qt graphics_toolkit with X-client and X-Sever

Submitted by:  Tatsuro MATSUOKA <tmacchant>
Submitted on:  Sat 26 Jan 2019 07:17:43 AM UTC  
Category:  Plotting with OpenGL Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Other
Status:  Works For Me Assigned to:  None
Originator Name:  Tatsuro MATSUOKA Open/Closed:  Open
Release:  4.4.1 Operating System:  Other

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Sat 09 Feb 2019 07:27:36 AM UTC, comment #14: 

--nowgl and  LIBGL_ALWAYS_INDIRECT='' for VcXsrv,
plot(1:10) => plot appears on qt toolkit on cygwin octave, octave on wsl.

One note for Cygwin octave
libGL error: Windows-DRI extension not available

appears after

However, octave hangs --nowgl for VcXsrv for X11 forwarding.

I think that this is an issue of X-sever for windows.

Tatsuro MATSUOKA <tmacchant>
Mon 04 Feb 2019 11:23:07 PM UTC, comment #13: 

For me,
--nowgl for VcXsrv, crash octave at plot(1:10)
--nowgl for Cygwin-X , no change at plot(1:10)

Tatsuro MATSUOKA <tmacchant>
Mon 04 Feb 2019 10:57:43 AM UTC, comment #12: 

In general plotting problem on Cygwin are due to GL driver issue
and usually both fltk and qt are impacted.
Try running the X server with "-nowgl" option.

marco atzeri <matzeri>
Mon 04 Feb 2019 12:02:15 AM UTC, comment #11: 

I have built 5.0.90 on Ubuntu 18.04 on WSL windows 10.
The result is the same with that of 4.4.1.

Tatsuro MATSUOKA <tmacchant>
Sun 03 Feb 2019 10:22:01 PM UTC, comment #10: 

I add Marco Atzeri to the CC.list because he is a maintainer of octave fot Cygwin.

How about qt graphics_toolkit on octave on cygwin, on your environments.

Tatsuro MATSUOKA <tmacchant>
Sun 03 Feb 2019 10:01:18 PM UTC, comment #9: 

To Rik.
I have not built 5.0.90 on WSL (Windows Subsystem for Linux) and Cygwin. I have built it on remote Ubuntu 16.04 (X11 forwarding).

For octave 5.0.90 on remote Ubuntu 16.04 connected with windows though ssh with X11 forwarding and with Xsrver on windows,
the situation is the same as that in 4.4.1.


Tatsuro MATSUOKA <tmacchant>
Sun 03 Feb 2019 04:02:42 PM UTC, comment #8: 

@Tatsuro: Is this still a problem with the release candidate 5.0.90?

Rik <rik5>
Project Administrator
Sun 27 Jan 2019 04:33:26 AM UTC, comment #7: 

I currently do not install GUI on remote machine.
I will prepare another Ubuntu PC for the test.
It takes a little bit time to test it.

Tatsuro MATSUOKA <tmacchant>
Sun 27 Jan 2019 12:38:52 AM UTC, comment #6: 

To clarify:
I cannot reproduce this problem with current octave (either
dev or stable). But I used to have some problems with
octave and some other graphical programs running through ssh forwarding. At the moment I still have an issue with eog and evince e.g... (Okular and gwenview  work fine).

Can you start an xterm on remote machine?


Dmitri A. Sergatskov <dasergatskov>
Sun 27 Jan 2019 12:33:11 AM UTC, comment #5: 

Sorry my description might be poor.

I am using linux version (including Cygwin) on Windows.

X server application is working on windows 10.
1. VcXsrv
2. Cygwin-X

Octave 4.4.1 is working on 

1. Cygwin x64 on the same windows 10 PC
2. Ubuntu 18.04 on Windows Subsystem for Linux (WSL) on the same windows 10PC
3. remote Ubuntu 16.04.5 connected with "ssh -XC" (X11 Forwarding)

Tatsuro MATSUOKA <tmacchant>
Sun 27 Jan 2019 12:22:23 AM UTC, comment #4: 

I tested X-server on Windows 10 (VcXsrv and Cygwin-X sever).
I have to test X-sever on linux but I need time to prepare another machine to install linux with X-sever.

Tatsuro MATSUOKA <tmacchant>
Sat 26 Jan 2019 11:54:26 PM UTC, comment #3: 

I suspect this is an X11 (Wayland?) issue.
Does your Ubuntu run Wayland or Xorg?
On my machines if I run "eog some_picture.png" on remote machine it pops up window on the remote machine rather than on local.


Dmitri A. Sergatskov <dasergatskov>
Sat 26 Jan 2019 11:35:06 PM UTC, comment #2: 

On octave 5.0.9 on Ubunu 16.04.5 connected with "ssh -XC" (X11 Forwarding)

The result was the same.

Tatsuro MATSUOKA <tmacchant>
Sat 26 Jan 2019 07:19:29 AM UTC, comment #1: 

On fltk and gnuplot, there is no problem.

Tatsuro MATSUOKA <tmacchant>
Sat 26 Jan 2019 07:17:43 AM UTC, original submission:  

I have tried to use octave X-client and X-Sever system.

Octave version is 4.4.1

 VcXsrv on windows 10.
 Ubuntu 18.04 on WSL
 Cygwin x64
 Ubuntu 16.04 connected with "ssh -XC" (X11 Forwarding)

On the system,


with qt graphics_toolkit gives blank page or other images of other X-client software or thread.

See an attached file

Tatsuro MATSUOKA <tmacchant>


(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attach Files:

Attached Files
file #46102:  plot_qt.png added by tmacchant (4KiB - image/png)


Depends on the following items: None found

Items that depend on this one: None found


Carbon-Copy List
  • -email is unavailable- added by matzeri (Posted a comment)
  • -email is unavailable- added by tmacchant (cygwin version octave mainteiner)
  • -email is unavailable- added by rik5 (Posted a comment)
  • -email is unavailable- added by dasergatskov (Posted a comment)
  • -email is unavailable- added by tmacchant (Submitted the item)

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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2019-02-03 tmacchant Carbon-Copy- => Added marco.atzeri@gmail.com
    2019-02-03 rik5 StatusNone => Works For Me
    2019-01-26 tmacchant Attached File- => Added plot_qt.png, #46102

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