I hit this issue on my Dell Vostro 1310 after an upgrade to Ubuntu 9.04 aka Jaunty Jackalope - amd64. When I boot, most often, the onboard keyboard and mouse are dead. Most people reset and when it comes up again, it works. I had found the workaround in suspend/resume of the system. But honestly, it was a pain.
Finally found this bug:
https://bugs.launchpad.net/ubuntu/+bug/341094The workaround mentioned there viz. adding the options
i8042.reset i8042.nomux i8042.nopnp i8042.noloop
at the end of the list of kernel parameters in
/boot/grub/menu.lst
works for me.
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