I don't know if it is from kernel 2.6.30 or if something else changed, but my keyboard does not behave as normal. It seems like the "key up" signal from the previous key is causing the repeat of the current key to get interrupted. This happens everywhere, not only in X, but in console as well.
For example, try this: Type some text, like XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX and then hold left arrow. Your cursor will move to the left until you release the key. Now try to hold the right arrow after you've already been holding the left arrow. It will start to move to the right. Previously, it would continue moving to the right after you released the left arrow. Now, the keyboard repeat STOPS once you release the PREVIOUS key. So, in other words, the repeating of the right arrow is stopped when I release the left arrow... which causes the cursor to stop, and causes me to become aggravated. :P Has anyone else noticed this? I hope it's not a new "feature" :) Maybe later tonight I'll try to go back to 2.6.29 and see if this truly was the thing that brought on this change.