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I am using kdemod 4.2. I followed the wiki and added
Option "AccelMethod" "exa"
Option "MigrationHeuristic" "greedy"
Option "ExaNoComposite" "false"
to the device section and added INTEL_BATCH="1" to /etc/environment. The performance has improve but now the notification tray of kde 4.2 doesn't show any icon.
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Option "MigrationHeuristic" "greedy"
This is the problem, comment it out.
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