Radeon KMS Gets Faster X-Video Support
If using the latest ATI open-source driver Git code for kernel mode-setting, there may be slightly better X-Video support without any visual slowdowns/problems. Pauli Nieminen has changed around the code so that a video buffer is allocated in the GTT (Graphics Translation Table) to provide faster memory operations that haven't been accelerated by KMS.
The patch that provides the performance boost to X-Video under ATI kernel mode-setting can be found on the xorg-driver-ati mailing list and has since been committed.
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