Re: Asus S5N laptop

Fri Jun 18 2004, Bob Tennent wrote:
> This system uses an external CD/DVD player via a USB port.  It seems to be 
> at /dev/scd0
> with a symbolic link there from /dev/dvd:
> 
-snip-
> /dev/dvd -> scd0
> Valid DVD devices:
> WARNING: No DVD devices found
> 
> but unencrypted DVDs play fine in ogle.. Encrypted ones give
> 
> libdvdcss error: css error: ioctl_ReadCopyright failed, make sure there is 
> a DVD in the
> drive, and that you have used the correct device node.
> libdvdcss debug: could not check whether the disc was scrambled
>
This isn't really Ogles fault.  Linux has it's strange special ioctl interface
to the CSS (the DVD entryption stuff) that is implemented for ide-crom and 
ide-scsi.  It's really just ATAPI/SCSI commands though.
However the USB stack (and other communication stacks) does not implement this.
So in short Linux does not support USB DVD drives.

-snip-
> 
> Regionset fails to read (much less set) the region code on the DVD.
> 
For the same reson, the ioctls used aren't implented...

> What do I do?
> 
Go ask/complain with the linux kernel/usb developers.

Regards
Håkan