It seems like that this bug was corrected in 2.6.28 - I have tried the
daily build of Jaunty with 2.6.28-11-generic (and also two other,
2.6.29-based distros: Fedora10 and Chaox) and I could use the CF card
without any problem.
(My configuration: Asus A7N8X-E Deluxe Motherboard (NForce2 chipset),
I have encountered the same problem and it's actually a known, (probably)
general Linux problem:
http://bugzilla.kernel.org/show_bug.cgi?id=11576
** Bug watch added: Linux Kernel Bug Tracker #11576
http://bugzilla.kernel.org/show_bug.cgi?id=11576
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Ubuntu install to Compact Flash w/ ata_pi