I am adding my success story here, in case it helps somebody... I had the same speed problems with my 2 x ATAPI LG DVD Drives on Ubuntu Jaunty development. My mainboard is an ASUS A8R32-MVP Deluxe with the ULi M1575 Southbridge.
I mean dvd writing was extremely slow and I couldn't get a decent DVD movie playback (too many lags). Here is the dmesg message I was getting: [ 7.684439] ata8.01: ATAPI: HL-DT-ST DVDRAM GSA-4167B, DL10, max UDMA/33 [ 7.684457] ata8.01: WARNING: ATAPI DMA disabled for reliablity issues. It can be enabled [ 7.684459] ata8.01: WARNING: via pata_ali.atapi_dma modparam or corresponding sysfs node. I followed these workarounds: Added 1) "options pata_ali atapi_dma=1" in /etc/modprobe.d/options (new file for me!) 2) "echo 1 > /sys/module/pata_ali/parameters/atapi_dma" in /etc/rc.local and finally I added "pata_ali atapi_dma=1" to "/etc/initramfs-tools/modules" All these to be sure! :) After the reboot (the dmesg messages still appear!) the problem was finally solved. Now I can watch and write DVDs at full speed. Is there a Jaunty specific bug for this? -- DMA and UDMA issues with intrepid https://bugs.launchpad.net/bugs/292142 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
