Huge lag of keyboard inputs
I upgraded to Ubuntu 9.04 recently and had experienced a weird keyboard input problem. Sometimes a certain program stops responding to any keyboard inputs for a short period of time, then all of a sudden all the keys I've pressed jumps out at once. It only happens to one program at a time. The programs I've had this issue with include Firefox, Emacs 23.1, konsole, eclipse. It happens frequently, like three to four times in an hour. I thought this might be a Ubuntu issue, so I switched to Fedora 11. And I have the same problem. So I'm not sure which part of the system is responsible for this bug, KDE 4.3, the kernel, X, or some other program. Any hints?