Need help with DVD-ROM DMA support on Acer Aspire 5680
I am having problems with the speed of the DVD-ROM on Acer Aspire 5680. I have managed to start DMA on the hard drive, but using hdparm on the dvd results in:
kireto ~ # hdparm -d 1 /dev/hdc
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)
I am using kernel linux-2.6.22-gentoo-r8. I have look several times in the kernel config to find a suitable module. I have even tried compiling most of them into the kernel (of course not all of them in one time), but with no success.
dmesg reports the following for the dvd-rom:[I]
hdc: MATSHITADVD-RAM UJ-85JS, ATAPI CD/DVD-ROM drive
can you help me in this situation?