https://bugs.freedesktop.org/show_bug.cgi?id=34618
--- Comment #9 from peterle@hottemptation.org 2011-02-23 10:53:55 PST --- http://linux.derkeiler.com/Mailing-Lists/Kernel/2011-01/msg00351.html
Looks very similar. I can't approve that pressing a single button or generating load on the machine speeds up scrolling, but after changing the tty and switching back the output is (of course) completely printed to the terminal.