Workaround at end of message.

I have been experiencing the same bug.  After reading this bug report
and doing a little experimentation, I can confirm that output
(specifically scrolling) to /dev/console triggers the screen shifting to
occur.  Furthermore, the problem only occurs when /dev/console is
connected to the vga console.

Once the problem has occurred,
    echo -n > /dev/console
does not affect the shifting since it omits the carriage return and does not 
scroll the screen.
    echo -n "a" > /dev/console
Does affect the shifting after being run 80 times, causing the console to 
scroll.

Until a kernel fix is available, I have worked around the problem by adding 
    console=ttyS1,38400
to my kernel boot options (/boot/grub/menu.lst) to prevent all output to the 
vga console.

--
Steve

-- 
(Multiseat) screen shifts when /dev/console written to
https://bugs.launchpad.net/bugs/153425
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