Comment 9 for bug 182996

i've upgrade to the latest Hardy kernel

( Linux version 2.6.24-5-generic (buildd@vernadsky) (gcc version 4.2.3 20080114 (prerelease) (Ubuntu 4.2.2-7ubuntu1)) #1 SMP Thu Jan 24 19:45:21 UTC 2008 (Ubuntu 2.6.24-5.8-generic)

still same problem, one remark, after reseting cdrom with command

   sudo hdparm -w /dev/hdc

we can see that DMA has been disabled, so in order to re-enable DMA do command

   sudo hdparm -d1 /dev/hdc

to see if DMA is enabled do following command

   sudo hdparm /dev/hdc

/dev/hdc:
 IO_support = 1 (32-bit)
 unmaskirq = 1 (on)
 using_dma = 1 (on) <--------------------- DMA is enabled
 keepsettings = 0 (off)
 readonly = 0 (off)
 readahead = 256 (on)
 HDIO_GETGEO failed: Inappropriate ioctl for device

after enable of DMA i could use my CDROM with a decent data transfer