I have a fresh install of RH7.1 in a Dell Inspiron 5000e laptop (upgraded to latest A04 BIOS). Basic distribution works. PCMCIA ethernet and modem work fine with minor problems on suspend where ethernet card needs to be re-inserted to function. A more severe problem showed up when operating an Adaptec 1460D PC Card SCSI adapter. The SCSI adapter is recognized and the attached DAT drive works fine (everything works) but the computer locks up when the 1460D card is extracted. There is no response from keyboard, mouse or external ping from another computer. The system also locks up when doing a suspend. No trace of anything about the lockup in the message file. I also tried an external SCSI CD drive with same results. Note that these problems to not occur when no devices are attached to the 1460D card, in that case both suspend and card extraction work with no lockups. The lockup can be avoided by rmmod on the PC card driver before suspend.
It seems the scsi layer or the driver doesn't like hotplug ;) Can you give me the output of lsmod so I can see which driver your scsi card uses ?