I managed to reproduce this bug with Wormux, while a game was being loaded. However, as I had enabled Ctrl+Alt+Backspace, when I restarted X, the heavy I/O disk usage had gone, so it might be a Xorg bug.
I managed to reproduce this bug with Wormux, while a game was being loaded. However, as I had enabled Ctrl+Alt+Backspace, when I restarted X, the heavy I/O disk usage had gone, so it might be a Xorg bug.