Really nice that you guys narrowed it down to a single patch!

In general, keep in mind that no patch is ever dropped unless there is a
serious problem with it (and thus you should investigate why it was
dropped before you mod you systems using such a patch). However, this
backfill patch you mention above was actually dropped from Ubuntu
because it causes graphics corruption on _intel_ graphics cards which
means that I can't see any good reason for fglrx users not to use this
patch. If someone is interested, the relevant intel bug is here:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/254468

Good news is that there might be another way to workaround the intel
graphics corruption issue (i.e by using UXA mode). In addition, we are
currently evaluating the possibility of switching to UXA mode for all
intel cards in karmic. If UXA ships by default in karmic and we confirm
that it fixes the graphics corruption we might be able to re-enable the
backfill patch by default and get karmic to run fast for fglrx users
again.

-- 
[ubuntu 9.04 beta]slow unminimizing with ati card and desktop effects enabled
https://bugs.launchpad.net/bugs/351186
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