BugLink: https://launchpad.net/bugs/530346

The OR has verified that position_fix=1 is necessary to work around
errors on his machine.

Reported-by: Tom Louwrier
Cc: <stable@kernel.org>
Signed-off-by: NDaniel T Chen <crimsun@ubuntu.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>