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[ishields <ianshields@xxxxxxxxx>]

For the record, I see the same errors still on my AMD system when I
install Lucid. If you need any of the logs, let me know.

Despite the title of this bug report, the problem is not restricted to
xclock. I think a more accurate characterization of the issue might be:

When desktop effects are enabled screen capture using alt-print screen fails to capture the frame. Programs such as import also fail if they are asked to copy the frame (e.g. by clicking on the title bar) with an error like
ian@attic4:~$ sleep 3; import shot-ff.png
import: unable to read X window image `': Resource temporarily unavailable @ xwindow.c/XImportImage/5020.

xwininfo -children also reports very different results if you click on
the title bar of a wind and desktop effects are not enabled vs. the
results if you have desktop effects enabled. Two examples for the
Firefox window I am using to enter this information.

Without desktop effects:

ian@attic4:~$ xwininfo -children

xwininfo: Please select the window about which you
          would like information by clicking the
          mouse in that window.

xwininfo: Window id: 0x3a000b4 "Bug #464031 in fglrx-installer (Ubuntu):
“Cannot do screen capture of xclock window” - Mozilla Firefox"

  Root window id: 0x142 (the root window) (has no name)
  Parent window id: 0x480002f (has no name)
     2 children:
     0x3a00124 (has no name): ()  1171x994+0+0  +1+51
     0x3a000b5 (has no name): ()  1x1+-1+-1  +0+50


With desktop effects
ian@attic4:~$ xwininfo -children

xwininfo: Please select the window about which you
          would like information by clicking the
          mouse in that window.

xwininfo: Window id: 0x460010e (has no name)

  Root window id: 0x142 (the root window) (has no name)
  Parent window id: 0x142 (the root window) (has no name)
     19 children:
     0x120159e (has no name): ()  1x1+0+0  +0+24
     0x120159d (has no name): ()  1x1+0+0  +0+24
     0x120159c (has no name): ()  1x1+0+0  +0+24
     0x120159b (has no name): ()  1x1+0+0  +0+24
     0x120159a (has no name): ()  1x1+0+0  +0+24
     0x1201599 (has no name): ()  1x1+0+0  +0+24
     0x1201598 (has no name): ()  1x1+0+0  +0+24
     0x1201597 (has no name): ()  20x20+30+4  +30+28
     0x1201596 (has no name): ()  20x20+50+4  +50+28
     0x1201595 (has no name): ()  20x20+10+4  +10+28
     0x1201594 (has no name): ()  16x20+1157+1006  +1157+1030
     0x1201593 (has no name): ()  1141x5+16+1021  +16+1045
     0x1201592 (has no name): ()  16x20+0+1006  +0+1030
     0x1201591 (has no name): ()  1x964+1172+42  +1172+66
     0x1201590 (has no name): ()  1171x1019+1+4  +1+28
     0x120158f (has no name): ()  1x964+0+42  +0+66
     0x120158e (has no name): ()  16x42+1157+0  +1157+24
     0x120158d (has no name): ()  1141x4+16+0  +16+24
     0x120158c (has no name): ()  16x42+0+0  +0+24

-- 
Cannot do screen capture of xclock window
https://bugs.launchpad.net/bugs/464031
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