Arrandale is a pretty recent chipset and it's support is still rather incomplete (we're still fielding some bad bugs with it in natty).
It's likely that in lucid the performance is bad simply because driver support was immature. Try updating to a newer kernel, or re-testing against natty. ** Summary changed: - kwin uses way too much CPU when there's no activity + [Arrandale] kwin uses way too much CPU when there's no activity ** Changed in: xserver-xorg-video-intel (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/452096 Title: [Arrandale] kwin uses way too much CPU when there's no activity -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs