I've added to the bug 370159 this workaround for the hot plug function of SD 
Card reader and firewire:
adding to /boot/grub/menu.lst the string
"pciehp.pciehp_force=1"
(and eventually also "pciehp.pciehp_poll_mode=1", but for me the first option 
was enough). I added it directly at the end of the kernel 2.6.28, in the line 
starting with "kernel":

kernel /boot/vmlinuz-2.6.28-8-generic
root=UUID=978d9a41-90b5-43ba-a434-4d6ac3e44bea ro quiet splash
pciehp.pciehp_force=1

In the blog I read it was written to add this string after the commented
line # defoptions=quiet splash but I didn't because I'm usually running
the kernel 2.6.27 (that should manage pciehp as a module)

-- 
SDHC Cards do not work in Dell Mini 9 internal card slot with Linux 2.6.28
https://bugs.launchpad.net/bugs/359323
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