[Bug 169615] kde4 GUI very unresponsive and slow (scrolling, resizing) with "ATI Radeon VE"

[shlomif at iglu.org.il]

https://bugs.kde.org/show_bug.cgi?id=169615


shlomif at iglu.org.il changed:

           What    |Removed                     |Added
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                 CC|                            |shlomif at iglu.org.il




--- Comment #20 from  <shlomif iglu org il>  2009-08-17 22:35:55 ---
Hi all!

I'm experiencing similar problems with Dolphin (for a long time) and more
recently with Kopete and KWin:

https://qa.mandriva.com/show_bug.cgi?id=52716

Reading from the bug:

{{{{{{{{{{{{{{{{
Description of problem:

I'm using the radeonhd driver with my ATI Radeon HD 2600 Pro card. When running
KDE-4.3.0's KWin, it takes a lot of time to set the active window by hovering
above it with the mouse (I have focus follows mouse). IceWM does not exhibit
this problem, and it used to be OK up to a previous Cooker upgrade.

I will attach my xorg.conf file shortly.

I should note that Kopete has a similar problem with scrolling, and these seem
to be the only KDE apps affected.

Version-Release number of selected component (if applicable):


How reproducible:

Always

Steps to Reproduce:
1. Update to latest cooker.
2. Use the radeonhd driver.
3. Start X in KDE 4.3.0 mode.
4. Try to switch windows.

.
.
.

OK, here's what I discovered since then:

1. After disabling "EXA" in xorg.conf, KDE 4 and Kopete had become fast again:

{{{{{{{{{
# Commented out.
# Option "AccelMethod" "EXA"
}}}}}}}}}

However, after this was enabled, then some gtk+2 apps have become sluggish -
most notably XChat.

2. Someone on #mandriva-cooker suggested that I'll use the "radeon" driver
instead of "radeonhd". I switched to using it using drakx11 (I'll attach my
up-to-date xorg.conf soon). However, KDE 4 and Kopete are still problematic as
of Mandriva Cooker from today.

3. I enabled the KDE 4 desktop effects and KDE 4 and Kopete are still sluggish.

Regards,

-- Shlomi Fish
}}}}}}}}}}}}}}}}

However:

(In reply to comment #10)
> Well, i found THE solution to problem. Apparently, the laggines is solely due
> to QT. I found on some forum, that there is apparently a new way of rendering
> that will be soon the default for Qt4 apps. However, it can already be tried
> out by:
> 
> <qt/kde-app> --graphicssystem raster
> 

This seems to fix the problem for Kopete. Many thanks! Now I'll see if I can
find a way to try kwin with it , and see how dolphin behaves with it.

> So for dolphin this is:
> 
> dolphin --graphicssystem raster
> 
> With this new system everything is absolutely smooth. For me it is already
> stable, although it is still considered not. IMPORTANT: for dolphin, you need
> to kill all dolphin processes before trying this out, otherwise it won't work.
> 
> Also all other apps i tried run much smoother now (especially kile).
> 
> So finally, i think this bug report can be closed as it is not kde or dolphin
> specific and a solution is almost there.

Regards,

-- Shlomi Fish

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