[Interest] QXcbConnection errors.

Bill Crocker william.crocker at analog.com
Sun Sep 4 23:30:34 CEST 2016


Hello:

I am trying to port two of my apps from Qt 4.8.6 to Qt 5.7.0
(I am also moving from RHEL5 to RHEL6 at the same time.)
I can build them and one appears to run properly, I just get a
little noise on start-up...

App #1:

XXX-lx01:app: App: *W*, failed to get the current screen resources 
(/nobackup/XXX/qt/qt-everywhere-enterprise-src-5.7.0/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:412, 
void QXcbConnection::initializeScreens())

App: *W*, QXcbConnection: XCB error: 173 (Unknown), sequence: 170, resource id: 
91, major code: 150 (Unknown), minor code: 20 
(/nobackup/XXX/qt/qt-everywhere-enterprise-src-5.7.0/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:996, 
void QXcbConnection::handleXcbError(xcb_generic_error_t*))



App #2:

The other one produces quite a bit more noise and never appears on the screen,
even though the debugger shows it in the main event loop...

App: *W*, failed to get the current screen resources ((null):0, (null))
[New Thread 0x7fffed41d700 (LWP 22148)]
App: *W*, QXcbConnection: XCB error: 173 (Unknown), sequence: 170, resource id: 
91, major code: 150 (Unknown), minor code: 20 ((null):0, (null))
App: *W*, QXcbConnection: XCB error: 8 (BadMatch), sequence: 364, resource id: 
91, major code: 1 (CreateWindow), minor code: 0 ((null):0, (null))
App: *W*, QXcbConnection: XCB error: 3 (BadWindow), sequence: 365, resource id: 
67108868, major code: 2 (ChangeWindowAttributes), minor code: 0 ((null):0, (null))
App: *W*, QXcbConnection: XCB error: 3 (BadWindow), sequence: 366, resource id: 
67108868, major code: 18 (ChangeProperty), minor code: 0 ((null):0, (null))
App: *W*, QXcbConnection: XCB error: 3 (BadWindow), sequence: 367, resource id: 
67108868, major code: 18 (ChangeProperty), minor code: 0 ((null):0, (null))
...
...
...

I see items in this area as a result of a web search,
but no recommendations as to the solution.

Does anyone have any experience in this area.

Thanks.

Bill




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