Montblanc. I'm not sure of what kind of 'full speed writting' you are talking about.
My observation is that pata_ali DOES NOT WORK properly with CD/DVD drives. Burinig a disck using pata_ali is hardly possible, takes 100% cpu and takes forever since cdrom DMA transfers are disabled. Enabling DMA through /sys makes reading/writting impossible (errors). Using ata_generic instead of pata_ali solves all the problems. DMA works fine. Current ubuntu kernels prevent the user to choose ata_generic over pata_ali! Regarding possible inferior performance of ata_generic I've discovered that there are none. See attached performance and dmesg results. Files: *.custom hold results for my customized kernel (see post #58) with ata_generic instead of pata_ali driver. Other files hold results for the current Karmic kernel with pata_ali. So there are two possible solutions: 1. somebody fixes pata_ali driver which seems to be broken - mind the warning: WARNING: ATAPI DMA disabled for reliablity issues - it's ridiculous, especially that ata_generic works fine. 2. ubuntu developers prepare the kernel in such a way which allows to use generic_ata driver! which I agree is kind of workaround, but it might be just good enough, and it's way better that the current situation which prevents using a cdrom/dvd drive! -- [HARDY-LUCID] No DMA nor 32bits IO support https://bugs.launchpad.net/bugs/228302 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
