[Bug 27627] Scrolling causes screen corruption

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27627

--- Comment #7 from Raúl <rasasi78 at gmail.com> 2010-04-27 13:48:34 PDT ---
Hello:

This is the very same problem as I'm experiencing. Same graphics stack as
Benjamin stated. rv500 family card. I'd also notice that xserver package in
Debian is 1.7rc1 plus a patch taken from 1.7rc2: “exa: handle pixmap
create/destroy in lower layers”

I've done some tests tweaking xorg parameters, and I've found that setting 
"EXANoDownloadFromScreen" avoids somehow this corruption, yet leaving another
different one, reported in another bug which I'm unable to find right now. As a
sidenote I also find that enabling this worsen performance in a noticeable
manner. For instance, after doing some work on a desktop, switching to another
one takes approximately half a second**

I've also tried AccelDFS "off"(on its own) which also avoids the artifacts
explained in this bug, but it has an impact on performance slightly worst than
the previous option. This is very subjective, so maybe this appreciation is
wrong.

Finally, I've also tried "exaNoMigration" (to be confirmed soonish) but this
option doesn't result in any outcome.

**Warning: very inaccurate measurement ;)

Regards,

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