I have been testing Fedora core/1 on a Dell Inspiron 5100 for the past
few weeks, and most things have gone well. Recently, however, I tried
using a keyspan usb-to-serial adapter, because the Inspiron 5100 has no
serial ports, and found that the current 2.4.22-1.2249.nptl kernel
doesn't completely support this device.
The attached patch files include changes to the kernel-2.4.spec file and
a patch file from the vendor:
http://www.keyspan.com/support/linux/files/currentversion/patch/
With these changes the kernel recognizes the device, uploads the
firmware, and registers the new serial port as /dev/ttyUSB0.
Just my $0.02,
-Randy