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[Geoff <576288@xxxxxxxxxxxxxxxxxx>]

I am also experiencing this bug in 11.04 on my Dell Inspiron 9300 (ATI
Radeon mobility X300, M22) using the open source ATI drivers.  The bug
only affects the repainting of the background in the main (ie. laptop)
display - active windows within the screen redraw themselves fine when
overlapped and then un-overlapped.  The external monitor behaves
properly.

It may be unconnected, but since upgrading to 11.04 when I try to run
Tux Racer (etracer) from a term, to test my graphics rendering speed, if
fails to run with error message: "*** etracer error: Couldn't initialize
video: Couldn't find matching GLX visual (Resource temporarily
unavailable)"

The Unity support test output is as follows:-

~$  /usr/lib/nux/unity_support_test -p

OpenGL vendor string:   X.Org R300 Project
OpenGL renderer string: Gallium 0.4 on ATI RV370
OpenGL version string:  2.1 Mesa 7.10.2

Not software rendered:    yes
Not blacklisted:          yes
GLX fbconfig:             yes
GLX texture from pixmap:  yes
GL npot or rect textures: yes
GL vertex program:        yes
GL fragment program:      yes
GL vertex buffer object:  yes
GL framebuffer object:    yes
GL version is 1.4+:       yes

Unity supported:          yes

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https://bugs.launchpad.net/bugs/576288

Title:
  second screen in dualhead setup doesn't refresh properly until
  reconfigured