*FIXED* DMA Support for CDROM's on VIA 82Cxxx

[Christoph Wiesen]

Am Sonntag 28 August 2005 15:12 schrieb James Gray:

> ***********************************************
> **** A kernel recompile is NOT necessary!! ****
> ***********************************************
>
> You simply need to edit the /etc/modules file as follows:
> 1. REMOVE (or comment out) the line:
>    ide-generic
> 2. Add following line *ABOVE* all of the ide-* lines (probably 1st line
>    under the comments section):
>    via82cxxx
>
> Now simply reboot and verify "sudo hdparm -d1 /dev/hda" doesn't return an
> error and that /dev/hda has DMA enabled (sudo hdparm /dev/hda).  Voila!
>
> To permanently configure /dev/hda with DMA support, edit /etc/hdparm.conf:
> /dev/hda {
>     dma = on
> }
>
> And here's some keywords for google to grok:
> ubuntu kubuntu via cdrom DMA VT82C586A/B/VT82C686/A/B/VT823x/A/C

That's a very helpful entry, thank you.
I had exactly the same problem and fixed it before with the a similar  
solution like you described.
Although I still have overall bad performance, which seems to be due to 
harddisk access (not measureable through hdparm though), this helped a lot 
and made me able to burn disks.
Hope it will be fixed in breezy out of the box though.

Cheers,
Chris