One thing that might improve the performance of the open-source radeon
drivers slightly is this patch which was in the upstream 3.0.18 kernel:
commit a674b8b3e345496a96aec389446650455b2fdfa1
Author: Alex Deucher
Date: Tue Jan 3 09:48:38 2012 -0500
drm/radeon/kms: disable writeback on pre-R300 asics
commit 28eebb703e28bc455ba704adb1026f76649b768c upstream.
We often end up missing fences on older asics with
writeback enabled which leads to delays in the userspace
accel code, so just disable it by default on those asics.
Reported-by: Helge Deller
Reported-by: Dave Airlie
Signed-off-by: Alex Deucher
Signed-off-by: Dave Airlie
Signed-off-by: Greg Kroah-Hartman
Ubuntu kernels 3.0.0-16.29 and later are based on this upstream kernel
version.
If the upcoming Ubuntu 12.10 "Quantal Quetzal" pulls in version 6.14.4
of the open-source radeon driver, released on 28 March 2012 (or the
just-released 6.14.5 version), you might get a small performance
improvement on your old Radeon Mobility 7500 due to the implementation
of KMS tiling. KMS tiling was already supported on newer Radeon
hardware.
You can monitor the driver git snapshot dates at
https://launchpad.net/ubuntu/+source/xserver-xorg-video-ati
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https://bugs.launchpad.net/bugs/883421
Title:
material accelaraion disappeared
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https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/883421/+subscriptions
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