It seems that the current (and previous) lucid kernel simply cannot work well enough to be usable on my notebook at least. Using http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.34-rc3-lucid/ works, but that's not the default kernel for lucid, of course. 2.6.32.21-31 makes xorg crashes on XVideo but also at some other cases according to my experience, switching off KMS does not help. The newer kernel in lucid since then (2.6.32.21-32) is even more worse, since the xorg does not even start, and machine freezes completly. So for me at least this bug makes lucid unusable on my hardware which is a show-stopper. Currently I am using 2.6.34 kernel from that PPA to be able to use lucid.
It seems that the current (and previous) lucid kernel simply cannot work well enough to be usable on my notebook at least. Using http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v2.6.34- rc3-lucid/ works, but that's not the default kernel for lucid, of course. 2.6.32.21-31 makes xorg crashes on XVideo but also at some other cases according to my experience, switching off KMS does not help. The newer kernel in lucid since then (2.6.32.21-32) is even more worse, since the xorg does not even start, and machine freezes completly. So for me at least this bug makes lucid unusable on my hardware which is a show-stopper. Currently I am using 2.6.34 kernel from that PPA to be able to use lucid.