Bug 469871

... For example running top in gnome-terminal fullscreen consumed 90% cpu.
All the time was spent migrating pixmaps out of vram ... if you think about
it, with only 5Meg offscreen, the "back buffer" pixmap that GTK+ creates
to draw in is going to be about that size if it needs to do a full window
redraw, so there won't be any memory to allocate mask pixmaps, etc.

I couldn't find an actual virtal size in Xorg.log, but 18304M works out
to 3328x1408, among other possibililities.

Owen, I think that /var/log/Xorg.0.log attached to this bug shouldn't hurt ;-).

I'm going to go out on a limb and say I've provided the information that
is needed here. Happy to provide more on request.

OK, I will let Dave fight this.

This seems like the sort of thing that would be caused by the patch to set a bigger default virtual size:

+
+    /* Make room for an external monitor if we have enough video ram */
+    if (scrn->VideoRam >= 65536)
+        width += 1920;
+    else if (scrn->VideoRam >= 32768)
+        width += 1280;
+    else if (scrn->VideoRam >= 16384)
+        width += 1024;
+    

And the 18.4 M is very likely the result of a new virtual size of 

              (2560 + 1920) x 1050

So it seems like the previous width would have been 2560. This *would* have been the case earlier, but we have a patch in the ati driver to report more sane limits (the radeon-6.9.0-remove-limit-heuristics.patch).

You can get the virtual size from the first line of xrandr --verbose.

This bug appears to have been reported against 'rawhide' during the Fedora 10 development cycle.
Changing version to '10'.

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This should be resolved in F12 and later, since we're using KMS and DRI2 on that card so we should be allocating buffers dynamically.

Okay, maybe not resolved, but at least differently broken.