I have a small problem where my DVD player got confused by a disk
and the ata driver ended up putting the driver in PIO mode.
Now I need to get it back into DMA without rebooting the computer.
hdparm -d1 /dev/sr0
/dev/sr0:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Inappropriate ioctl for device
HDIO_GET_DMA failed: Inappropriate ioctl for device
-------
ata9.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
ata9.00: cmd a0/00:00:00:00:fc/00:00:00:00:00/a0 tag 0 pio 131072 in
cdb 28 00 00 13 c6 4a 00 00 40 00 00 00 00 00 00 00
res 40/00:02:00:08:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
ata9.00: status: { DRDY }
ata9: soft resetting link
ata9.00: configured for PIO0
ata9: EH complete
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