Why "BackingStore" doesn't work with the "Xrender" extensions ?

Solution Unverified - Updated -


  • Unable to use BackingStore with the Xrender extension in custom application.


  • In sample test program try to draw two transparent rectangles in a window and move any other window to cover the window and then expose it, this will damage the two rectangles.
  • There are no problems if XRender calls not being used in program.
  • On RHEL 5.5, The issue will be gone if drawing a normal rectangle before or after. However this trick does not work on RHEL 6.4.
  • This issue was observed on RHEL 5.5 and RHEL 6.4.


  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • xorg-x11-server-Xorg

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