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QGIS 1.8.0 has been working fine for a number of months. Then I upgraded my system generally, which possibly included upgrades to xorg-server and QT, and now QGIS is sluggish/unresponsive to the point of being unusable.

Running from the command line shows a number of error messages:

using visual class 4, id 2b
Warning: loading of qgis translation failed [/usr/share/qgis/i18n//qgis_en_GB]
Warning: loading of qt translation failed [/usr/share/qt4/translations/qt_en_GB]
Debug: hijackWindow() context created for QSplashScreen(0x9fee058) 1 
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: QGLFramebufferObject: Unable to resolve framebuffer object extensions - make sure there is a current context when creating the framebuffer object.
Debug: QGLWindowSurface: Failed to create valid FBO, falling back 
Debug: Created Window Surface Pixelbuffer, Sample buffers: true 
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: Object::connect: No such slot QgisApp::newSpatialiteLayer() in /var/tmp/portage/sci-geosciences/qgis-1.8.0/work/qgis-1.8.0/src/app/qgisapp.cpp:888
Warning: Object::connect:  (sender name:   'mActionNewSpatialiteLayer')
Warning: Object::connect:  (receiver name: 'MainWindow')
Debug: hijackWindow() context created for QTipLabel(0xa5ae2c0, name = "qtooltip_label") 1 
Debug: Created Window Surface FBO QSize(147, 22) with samples 8 
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Debug: Created Window Surface FBO QSize(155, 22) with samples 8 
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Debug: hijackWindow() context created for QgisApp(0xa16d0e0, name = "MainWindow") 1 
Debug: Created Window Surface FBO QSize(1840, 1003) with samples 8 
Debug: hijackWindow() context created for QMenuBar(0xa0b5f20, name = "menubar") 2 
Debug: hijackWindow() context created for QStatusBar(0xa09ef28, name = "statusbar") 3 
Debug: hijackWindow() context created for QToolBar(0xa148ac8, name = "mFileToolBar") 4 
Debug: hijackWindow() context created for QToolBar(0xa147ea8, name = "mLayerToolBar") 5 
Debug: hijackWindow() context created for QToolBar(0xa1481c8, name = "mDigitizeToolBar") 6 
Debug: hijackWindow() context created for QToolBar(0xa147e00, name = "mAdvancedDigitizeToolBar") 7 
Debug: hijackWindow() context created for QToolBar(0xa148b80, name = "mMapNavToolBar") 8 
Debug: hijackWindow() context created for QToolBar(0xa159058, name = "mAttributesToolBar") 9 
Debug: hijackWindow() context created for QToolBar(0xa143930, name = "mHelpToolBar") 10 
Debug: hijackWindow() context created for QToolBar(0xa09f3a0, name = "mRasterToolBar") 11 
Debug: hijackWindow() context created for QToolBar(0xa1638e0, name = "mVectorToolBar") 12 
Debug: hijackWindow() context created for QToolBar(0xa0bde00, name = "mWebToolBar") 13 
Debug: hijackWindow() context created for QgsMapCanvas(0xa3a7448) 14 
Debug: hijackWindow() context created for QDockWidget(0xa4ead30, name = "Legend") 15 
Debug: hijackWindow() context created for QDockWidget(0xa51a108, name = "Overview") 16 
Debug: hijackWindow() context created for QToolBar(0xa040a18, name = "CAD-Tools") 17 
Debug: hijackWindow() context created for QToolBar(0xb1c97d8, name = "Dimensioning") 18 
Debug: hijackWindow() context created for QToolBar(0xb1c4ea8, name = "IntersectIt") 19 
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.
Warning: X Error: BadMatch (invalid parameter attributes) 8
  Extension:    135 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x4800013
Warning: QGLContext::makeCurrent(): Failed.

Not sure which of these error messages might have been there before when everything was working. Any clues? I'd like to get QGIS back again...

So far I have tried recompiling QGIS & a number of other libraries.

I'm on Gentoo.

share|improve this question
Hi No idea what most of that meant but i have noticed qgis get slower in the past few days. I am putting it down to my system but there seems to be a bug in it somewhere. – Gerald O'Reilly Jan 18 at 11:27
Possibly the upgrade broke your opengl acceleration. Can you test one of the opengl examples in Qt? – BradHards Jan 19 at 10:22
To answer my own question, the issue was the "QT Graphics System" setting. As part of the upgrade I had inadvertently switched to to the 'opengl' setting (which apparently is experimental) rather than 'raster' (which is the default). Users on Gentoo can do eselect qtgraphicssystem list to see the current setting and eselect qtgraphicssystem set raster to set it (back) to raster if needed. Everything back to normal now! – Paul Feb 3 at 1:15

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