I got an ATI x1400 mobility radeon as well, using a ThinkPad T60.
(german bug dscription here: http://forum.ubuntuusers.de/post/2472883/ )
1. the overall GPU performance is worse on lucid, then on karmic - on
both kernels so far. for example, I get 40 fps less in quake live, and
50 fps less in
this might also be my bug on a ThinkPad T60, ATI mobility radeon x1400,
as it looks pretty exactly like in the youtube video on the first post.
... but two things differ:
1. I got the pink errors and distortion not on an external display, but on the
default laptop screen.
2. overall performance
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