I've seen this option a dozen or so times compiling kernels, on the top level of "make menuconfig" there is a special option under "Processor Type and Features" for Dell Laptop support that is specific to the 8000 series. Now this is primarily for fan and cpu heat management and whatnot, but between that and trying out the newer ACPI and APM available under 2.4.19, that might knock out your problem.
Just an idea, I had problems with suspend on my i1400 Thinkpad all the way up through the 2.4.x series until 2.4.18 when it magically started blinking right back on from a sleep; before it took a good 30 seconds and then display went kazoo.
Cheers,
Finegan
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