bugGNU Octave - Bugs: bug #41304, Octave GUI in VNC produces many...


bug #41304: Octave GUI in VNC produces many Xlib warnings in the command window

Submitted by:  None
Submitted on:  Wed 22 Jan 2014 02:14:31 PM UTC  
Category:  GUI Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Other
Status:  Fixed Assigned to:  None
Originator Name:  joergB Originator Email:  -email is unavailable-
Open/Closed:  Closed Release:  3.8.0
Operating System:  GNU/Linux

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Fri 21 Mar 2014 02:48:16 PM UTC, comment #3: 

Looks fixed to me on the stable branch now. Errors go to the shell console that started the GUI (or presumably to the desktop environment error log if started from a launcher). This will be fixed in the next stable release (3.8.2, if any) or in the 4.0 release.

Mike Miller <mtmiller>
Project Administrator
Fri 21 Mar 2014 01:36:42 AM UTC, comment #2: 

Is this still a problem after this changeset?

changeset:   18569:90dbbafb0502
branch:      stable
parent:      18565:c08776badd3d
user:        John W. Eaton <jwe@octave.org>
date:        Tue Mar 18 12:19:18 2014 -0400
summary:     prevent X11 errors from appearing in GUI command window

Rik <rik5>
Project Administrator
Wed 22 Jan 2014 02:51:06 PM UTC, comment #1: 

Confirming and retitling to be more explicit about the problem.

Actually I just ran another Qt application, qtconfig-qt4, in the same VNC and it generates the same Xlib warnings about BadDrawables.

Basically the existence of the warning messages looks like a Qt library problem, for them to either solve or not. What makes it especially annoying in Octave is that stderr of the GUI goes to the command window so it shows up in the GUI itself. With most GUIs, stderr would be going to the terminal or to the ~/.xsession-errors log file.

Mike Miller <mtmiller>
Project Administrator
Wed 22 Jan 2014 02:14:31 PM UTC, original submission:  

Dear all,

whenever I run Octave with the GUI through VNC, I get this error message all the time:

Warning: X Error: BadDrawable (invalid Pixmap or Window parameter) 9
  Major opcode: 62 (X_CopyArea)
  Resource id:  0x0

By "all the time" I mean it appears 13 times when I start Octave and every time I right-click the command window and so on. Everything still seems to work fine, but the high frequency of this message does get a little annoying over time.

After reporting this to the octave-help list, Mike Miller replied the following:

Hi J?rg, I just tried this to verify and I do see the same. These are in fact warnings from the X library, not from Octave, so the "warning off" command will not help you in this case.

I also found this thread
but unfortunately it does not seem to contain a solution.



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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2014-03-21 mtmiller StatusConfirmed => Fixed
        Open/ClosedOpen => Closed
    2014-01-22 mtmiller StatusNone => Confirmed
        SummaryOctave GUI in VNC => Octave GUI in VNC produces many Xlib warnings in the command window

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