[Bug 28960] Screen tearing (some tiles rendered with offset) especially when scrolling etc. in DualHead mode on HD4350

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28960

--- Comment #15 from Grzegorz Wierzowiecki <grzegorz.wierzowiecki at pjwstk.edu.pl> 2010-07-10 04:54:12 PDT ---
(In reply to comment #0)
> I've met many problems with scrolling and window moving, but not only.
> In some apps, like OO-calc I meet wrongly rendered table... like part of screen
> copied and pasted with some offset in x and y axes. (Moving cursor refreshes
> those fragments, minimising and maximising window also might help... but
> enforcing refreshment is - at least - not comfortable).
> 
> In my case - ATI HD4350 PCI-E - problem appears when using DualHead mode,
> with turned off KDE Composition (OpenGL) in order to use basic rendering
> techniques (when using Composition, OpenGL etc. KDE crashes and X-Server
> restarts... but when playing OpenGL games like TuxRacer everything is ok).
> 
> My setup is to 1900x1200 monitors in Dual Head, one is in pivot.
> When using single head setup it is ok.
> 
> What I've found, is that 
> Putting option:
> 
> Option      "AccelDFS" "off"
> 
> into xorg.conf, helped (even I have PCI-E card), not rendering is correct, but
> performance decreased dramatically.
> 
> My software version is
> 
> $ LC_ALL=en pacman -Qi xorg-server | grep Version
> Version        : 1.8.1.902-1
> 
> $ LC_ALL=en pacman -Qi xf86-video-ati | grep Version
> Version        : 6.13.0-1
> 
> How could I help you to fix this?
> (btw. Is it right place to file such bug, or is there better?)

Let me go into a few details, what do I mean by "performance decreased"/"slow
performance", I hope it might help.

Slow performance with <<Option "AccellDFS" "off">> in xorg.conf, but with
proper rendering.

Slow performance means, everything "freezes", making like 1fps or maybe even
0.5fps (1 frame per 1-3 seconds) when :
* moving window
* scrolling contents of windows (no metter kde,gnome - WM is KDE)
* using some apps like:
** typing in OpenOffice
** typing in firefox
** etc.

While, some features perform well, like:
* watching video
* 3d opengl stuff
* virtual machine in virtualbox
* most console apps (most of my work)

But when one of those runs in parrarell with one of those from first group,
like for example:
* watching video and typing/scrooling/window-moving in OO/firefox
Than everything "freezes" and goes into "1 frame per 1-3 seconds".

Connection is that, those activities, which involves "freezing mode"/"1 frame
per 1-3 second" seems like similar or even the same, which makes "tearing" or
problems with refeshing in normal performance mode <<Option "AccellDFS" "on">>.

Best Greg.

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