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| = Primer =
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| Several popular graphics cards out there - especiall NVIDIA ones - exhibit performance problems with KDE4. These performance hits mostly concern [[Projects/Plasma|Plasma]] - the KDE4 desktop - and [[Projects/KWin|KWin]] - the KDE window-manager. Generally speaking this isn't due to KDE4 being unoptimized but a problem with the cards' graphics drivers. This page encompasses certain problems that might arise and how to get rid of them.
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| = Symptoms =
| | {{note|This page has been moved to Userbase. The new URL is: http://userbase.kde.org/GPU-Performance.}} |
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| This section summarizes several symptoms you might encounter and tries to explain possible causes.
| | Unfortunately I couldn't keep the history but thanks to everyone contributing information and translations to this page! |
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| == Resizing certain windows is choppy ==
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| ;Explanation : This might be due to your card advertising ''ARGB Visuals'' (basically translucency) without having proper support for them. Applications/windows concerned are the plasma desktop, the krunner dialog (Alt+F2), plasma's ''Add new widget'' dialog or a konsole window.
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| ;Test : If you want to make sure this issue is a problem for you, run <pre>$ XLIB_SKIP_ARGB_VISUALS=1 konsole</pre> on the command-line and try to resize the new konsole window (setting the environment variable <tt>XLIB_SKIP_ARGB_VISUALS</tt> turns off ''ARGB visuals''). If it resizes without problems, then this is certainly one of the problems you're facing.
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| === General ===
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| * You can set the BackingStore options in your xorg.conf:
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| <pre>Section "Device"
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| ...
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| Option "BackingStore" "true"
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| ...
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| EndSection "Device"</pre>This works for some (eg. konsole) but unfortunately not all windows.
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| === NVIDIA ===
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| * You can set the ''IntialPixmapPlacement'' with the ''nvidia-settings'' utility: <pre>$ nvidia-settings -a InitialPixmapPlacement=2</pre> This works for some (but unfortunately not all) NVIDIA cards.
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| === ATI ===
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| = Solutions =
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| == NVIDIA ==
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| == AMD/ATI ==
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| = References =
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Latest revision as of 15:33, 15 July 2012
Unfortunately I couldn't keep the history but thanks to everyone contributing information and translations to this page!
