[svlug] CDROM: hdc: lost interrupt (how to troubleshoot?)

[Erik Steffl]

Jeremy Zawodny wrote:
> 
> On Sun, Mar 24, 2002 at 11:14:58PM -0800, Erik Steffl wrote:
> >   yet more info: it works under windows, the ripping is fast, the ripped
> > file sound ok. Considering that I have bios set up to 'no pnp os' there
> > should be no difference between how windows sees that hw and how linux
> > sees it (as far as the resources go, interrupts etc.)
> >
> >   I checked the table that bios displays during boot - interrupt 15
> > (which is used for secondary ide, see below) doesn't seem to be used for
> > anything else.
> >
> >   the only difference between win and linux is that win doesn't use USB
> > (it's 95). could 9 interfere with 15?
> >
> >   how do I go about troubleshooting the lost interrupt (and VERY slow
> > ripping of audio CD)?
> 
> What does hdparm say about the device?
> 
> I have a faint recollection of getting that error when I tried messing
> with one of the hdparm settings...  Try forcing it to 16bit without
> DMA and see if that makes a difference.

  thanks,

  no it doesn't make any difference, it still freezes the cat
/dev/hdc|od, syslog says (normal reading of cd using cp or tar works
with no problems!):

Mar 25 01:24:49 localhost kernel: hdc: cdrom_decode_status: status=0x51
{ DriveReady SeekComplete Error }
Mar 25 01:24:49 localhost kernel: hdc: cdrom_decode_status: error=0x30
Mar 25 01:24:52 localhost kernel: hdc: cdrom_decode_status: status=0x51
{ DriveReady SeekComplete Error }
Mar 25 01:24:52 localhost kernel: hdc: cdrom_decode_status: error=0x30
Mar 25 01:24:55 localhost kernel: hdc: cdrom_decode_status: status=0x51
{ DriveReady SeekComplete Error }
Mar 25 01:24:55 localhost kernel: hdc: cdrom_decode_status: error=0x30
Mar 25 01:24:55 localhost kernel: hdc: ATAPI reset complete

 and cdparanoia is very slow, the following messages are in syslog:

Mar 26 00:00:11 localhost kernel: hdc: lost interrupt

  don't know what would be the equivalent of cat /dev/hdc in windows but
at least audio ripping works fine under windows so it's not hardware
problem (entirely)

  brief search of internet didn't reveal anything relevant, I am not
sure what to search for though. I found a message claiming that velocd
(tdk) works fine under linux... not sure if it was referring to exactly
the same model (mine is TDK CDRW321040B)

  any other ideas? TIA!

	erik