First, I would like to make it clear that I don't use RAID, and the following is no more than a suggestion based on seeing this as a standard hardware issue. And if not relevant/appropriate should be ignored.
In PCLOS I would run lsmod and lspci -nnk and check dmesg
I would then run the same commands in at least one of the distros' known to work.
Once it is determined which modules are missing I would attempt to create a remastered CD that includes the modified kernel.
I would also request the PCLinuxOS team add this to the ISO, giving them the details I used to get this working.