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Thread: Qt/X11 source-distro apps corrupting KDE Desktop background

  1. 22nd July 2009, 20:36 #1
    wdezell
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    Unhappy Qt/X11 source-distro apps corrupting KDE Desktop background

    All -

    I am trying to fall back to an older distro of Qt than the Qt 4.5.1 that ships with Fedora 11 as a workaround a broken QtMySQL driver in 4.5.1 (http://www.qtcentre.org/forum/f-qt-p...295-22654.html) but am running into problems with my source distro built apps as follows:

    • Exposed KDE4 Desktop white(app moved)
    • Other apps when moved produce same effect while my Qt app is running
    • KDE4 Plasma workspace context menu will not display
    • Problem observed with Qt apps compiled from Qt source distros 4.3.4 and 4.4.3
    • All Qt libraries (listed via ldd) resolve to Qt distro libraries
    • Problem does not appear if Qt app rebuilt under Fedora Qt 4.5.1
    • Problem clears after a while. Background redraws, context menus work
    • Using latest nVidia driver. OpenGL enabled, have tested with X11 backing store turned on & turned off


    Any suggestions at all as to what might be happening?

    Thanks,
    Bill


    Qt 4.4.3 build config:

    Qt Code: 
    1. Configuration .......  system-sqlite release shared dll largefile stl precompile_header separate_debug_info mmx 3dnow sse sse2  qt3support accessibility opengl minimal-config small-config medium-config large-config full-config reduce_exports ipv6 clock-gettime clock-monotonic mremap getaddrinfo ipv6ifname getifaddrs inotify system-jpeg system-mng system-png png system-tiff system-freetype system-zlib nis iconv glib dbus openssl x11sm xshape xrandr xrender fontconfig tablet xkb xmlpatterns svg webkit release                                                                            
    2. Debug ............... no                                                                                                                                                                            
    3. Qt 3 compatibility .. yes                                                                                                                                                                           
    4. QtDBus module ....... yes (run-time)                                                                                                                                                                
    5. QtXmlPatterns module  yes                                                                                                                                                                           
    6. Phonon module ....... no                                                                                                                                                                            
    7. SVG module .......... yes                                                                                                                                                                           
    8. WebKit module ....... yes                                                                                                                                                                           
    9. WebKit in Assistant   no                                                                                                                                                                            
    10. STL support ......... yes                                                                                                                                                                           
    11. PCH support ......... yes                                                                                                                                                                           
    12. MMX/3DNOW/SSE/SSE2..  yes/yes/yes/yes                                                                                                                                                               
    13. IPv6 support ........ yes                                                                                                                                                                           
    14. IPv6 ifname support . yes                                                                                                                                                                           
    15. getaddrinfo support . yes                                                                                                                                                                           
    16. getifaddrs support .. yes                                                                                                                                                                           
    17. Accessibility ....... yes                                                                                                                                                                           
    18. NIS support ......... yes                                                                                                                                                                           
    19. CUPS support ........ no                                                                                                                                                                            
    20. Iconv support ....... yes                                                                                                                                                                           
    21. Glib support ........ yes                                                                                                                                                                           
    22. GStreamer support ... no                                                                                                                                                                            
    23. Large File support .. yes                                                                                                                                                                           
    24. GIF support ......... plugin                                                                                                                                                                        
    25. TIFF support ........ plugin (system)                                                                                                                                                               
    26. JPEG support ........ plugin (system)                                                                                                                                                               
    27. PNG support ......... yes (system)                                                                                                                                                                  
    28. MNG support ......... plugin (system)                                                                                                                                                               
    29. zlib support ........ system                                                                                                                                                                        
    30. OpenGL support ...... yes                                                                                                                                                                           
    31. NAS sound support ... no                                                                                                                                                                            
    32. Session management .. yes                                                                                                                                                                           
    33. XShape support ...... yes                                                                                                                                                                           
    34. Xinerama support .... runtime                                                                                                                                                                       
    35. Xcursor support ..... runtime                                                                                                                                                                       
    36. Xfixes support ...... runtime                                                                                                                                                                       
    37. Xrandr support ...... yes                                                                                                                                                                           
    38. Xrender support ..... yes                                                                                                                                                                           
    39. FontConfig support .. yes                                                                                                                                                                           
    40. XKB Support ......... yes                                                                                                                                                                           
    41. immodule support .... yes                                                                                                                                                                           
    42. MySQL support ....... qt                                                                                                                                                                            
    43. SQLite support ...... plugin (system)                                                                                                                                                               
    44. OpenSSL support ..... yes (run-time)
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    Last edited by wdezell; 22nd July 2009 at 20:39. Reason: clarification
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  2. 22nd July 2009, 21:22 #2
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    wysota
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    Default Re: Qt/X11 source-distro apps corrupting KDE Desktop background

    Which KDE4 release you're using? By the way, can't you just compile MySql driver from Qt 4.4 against Qt 4.5? It should work just fine.
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.

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  3. 22nd July 2009, 21:43 #3
    wdezell
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    Default Re: Qt/X11 source-distro apps corrupting KDE Desktop background

    I hadn't thought of trying to use a source-compiled 4.4 MySQL driver with the rpm-installed 4.5.1. I suspect it might work but I'm unsure how to do it. I'd prefer to stay within a single version, though, as I deliver everything to my customer as is required for a complete source-up build (and I don't want to complicate support matters).

    yum list installed reports the following for kdebase:
    kdebase.i586 6:4.2.4-2.fc11


    I am puzzled about the behavior of the source-built Qt's. I've built using Qt source distros many times in the past and never encountered this problem. My ./configure options for X11 seem right to me.

    BE
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  4. 22nd July 2009, 23:03 #4
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    wysota
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    Default Re: Qt/X11 source-distro apps corrupting KDE Desktop background

    KDE 4.2 doesn't work fell with pre-Qt4.5 installations, as far as I remember.

    But I'd suggest solving the MySQL problem or building the older driver against a newer library. I'd even try deploying older binary driver into newer Qt installation, there is a high chance it will work regardless of different Qt releases.
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

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  5. 23rd July 2009, 01:10 #5
    wdezell
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    Default Re: Qt/X11 source-distro apps corrupting KDE Desktop background

    I seem to recall reading that 4.4 and 4.5 are source/binary compatible. I just rebuilt 4.4.3 to re-test one more time (display still corrupted). I think I will take your suggestion and try installing the MySQL driver from the 4.4.3 build into the 4.5 tree. I'll ldd it an make sure there are no 4.4.3 dependencies burned into it.

    Thanks for the suggestion.

    Bill
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  6. 23rd July 2009, 21:10 #6
    wdezell
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    Default Re: Qt/X11 source-distro apps corrupting KDE Desktop background

    UPDATE:

    The culprit is CPU cycles. My two (unmodified) apps grab a massive amount of CPU time for about 30-45 seconds wall clock time. This prevents desktop background redraw (and other things, like launching KSnapshot to get a picture of it).

    Not sure what's behind this yet. My main()'s fire off QSplashScreens and are liberally sprinkled with qApp->processEvents().
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