dma wont work on Compaq laptop after upgrade to 8.2

Machine is Compaq Presario 1260 Laptop using amdK6-333 cpu. I have been using SuSE since 7.0 on it and dma has funcitioned properly through 8.1. Could set and vary dma using hdparm as well as the boot paramaters. I upgraded to SuSE 8.2 and since then the dma will not enable. I use force dma during boot. Later I have tried to set it using hdparm. The message I get on either try is: HDIO_SET_DMA failed: Operation not permitted. The dma worked fine under default kernel 2.4.19 but not at all with the 2.4.20 as delivered with 8.2. Without DMA the laptop is agonizingly slow. Any suggestions? TIA Richard