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2.4.16-ben0 DVD block i/o breaks mouse, pmu

Here's another slight problem I'm having since upgrading to 2.4.16-ben0
on my powerbook titanium 1st generation.  When doing block i/o on the
dvd drive (dd if=/dev/hdc of=/dev/null), the mouse moves randomly and
the pmu reports spurious dead battery conditions.  During the dd, use of
the trackpad causes random pointer motion.  The battery is
intermittently reported at 2% or 3%, even when fully charged and plugged

The same problem does not happen if I bind /dev/hdc to a raw device and
dd from that.  The problem is only present when using regular i/o.


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