Tobias Diedrich wrote:
Possibly a known issue: After resume pata_amd drops from UDMA/33 to PIO on my system. Reloading the module puts both attached optical drives (master and slave) back to UDMA/33. AFAICS "simplex DMA is claimed by other device, disabling DMA" seems to be causing it to drop to PIO (but only after a suspend/resume cycle, not on boot or module load). Burning a DVD with 6x speed using PIO makes heavy use of burnproof and makes the whole system quite sluggish. :)
Yes, the fact that it's going into simplex mode is the problem, it wasn't in simplex to start with. It looks like pata_amd does an ata_pci_clear_simplex only for certain chip models, maybe this model needs it as well?
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