I have a PCI expansion card or video card that is supposed to support bus mastering, but I can't get bus mastering to work

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I have a PCI expansion card or video card that is supposed to support bus mastering, but I can't get bus mastering to work

Explanation:
PCI bus mastering is supposed to be supported by a video or expansion card, but is not working properly. (Note that problems with IDE hard disk bus mastering is discussed in this section, not here.)
Diagnosis:
Bus mastering problems are generally hard to diagnose, and often depend a great deal on the specific card. General problems with bus mastering can be related to the motherboard or BIOS settings.
Recommendation:

Consult the documentation for the peripheral card carefully. Usually the answer to the problem will be there somewhere.
Search your motherboard documentation for any hints as to whether all of your PCI slots support bus mastering, or only some of them. Some early and/or cheaper motherboards only supported bus mastering in some of their PCI slots, but not all of them.
Double-check all BIOS settings that are in the PCI / PnP settings group. Make sure that you are not disabling bus mastering, or assigning resources incorrectly to only ISA legacy cards.
You may have a resource conflict associated with the card..
Troubleshoot the expansion card.
Troubleshoot the motherboard.

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