External DVDRW trouble with kernel 2.6

wickdgin · 08-20-2004, 09:33 AM

I just changed over from Slackware 9.1 to Gentoo. I decided to use the modified 2.6.8 kernel. I am having trouble getting my external TDK IndiDVDRW to work, when it worked fine before in slackware using rescan-scsi-bus.

When I connect the drive using firewire, the system detects the drive as a generic scsi device and links it to sg0. However, this does me no good, as I need it to detect it as a scsi cdrom (sr0). I have scsi cdrom support compilled into the kernel. What is going wrong here???

Below is the dmesg output when the drive is connected:

ieee1394: Node changed: 0-01:1023 -> 0-00:1023
ieee1394: Node suspended: ID:BUS[0-00:1023] GUID[0010100345c4bd87]
ohci1394: fw-host0: SelfID received, but NodeID invalid (probably new bus reset occurred): 0000FFC0
ieee1394: Node changed: 0-00:1023 -> 0-01:1023
ieee1394: Node resumed: ID:BUS[0-01:1023] GUID[0010100345c4bd87]
ieee1394: The root node is not cycle master capable; selecting a new root node and resetting...
ieee1394: Node changed: 0-01:1023 -> 0-00:1023
ieee1394: Node changed: 0-00:1023 -> 0-01:1023
scsi1 : SCSI emulation for IEEE-1394 SBP-2 Devices
ieee1394: sbp2: Logged into SBP-2 device
ieee1394: Node 0-00:1023: Max speed [S400] - Max payload [2048]
Vendor: TDK Model: DVDRW840G Rev: 1.03
Type: CD-ROM ANSI SCSI revision: 02
Attached scsi generic sg0 at scsi1, channel 0, id 0, lun 0, type 5

****EDIT****
I have since gotten the drive to work, but have a problem when reconnecting the drive. Scroll down to the bottom for details.

wickdgin · 08-21-2004, 11:15 AM

I upgraded my kernel to 2.6.8.1, and changed sbp2, sr_mod, and sg (scsi_generic) to compile as modules (were compiled into kernel previously). Now when I load sbp2, and plug in my dvdrw I get this in my kernel messages:

Code:

ohci1394: fw-host0: SelfID received, but NodeID invalid (probably new bus reset occurred): 0000FFC0
ieee1394: Node changed: 0-00:1023 -> 0-01:1023
ieee1394: Node resumed: ID:BUS[0-01:1023]  GUID[0010100345c4bd87]
ieee1394: The root node is not cycle master capable; selecting a new root node and resetting...
ieee1394: Node changed: 0-01:1023 -> 0-00:1023
ieee1394: Node changed: 0-00:1023 -> 0-01:1023
scsi0 : SCSI emulation for IEEE-1394 SBP-2 Devices
ieee1394: sbp2: Logged into SBP-2 device
ieee1394: Node 0-00:1023: Max speed [S400] - Max payload [2048]
  Vendor: TDK       Model: DVDRW840G         Rev: 1.03
  Type:   CD-ROM                             ANSI SCSI revision: 02
Attached scsi generic sg0 at scsi0, channel 0, id 0, lun 0,  type 5
sr0: scsi3-mmc drive: 62x/62x writer cd/rw xa/form2 cdda tray
Attached scsi CD-ROM sr0 at scsi0, channel 0, id 0, lun 0

However, I still wasn't able to mount the sr0 device. The symlink just seemed to point to sg0. So I looked through the scsi devices and found a device named cd (this device wasn't here previously), that was mountable, so I was able to mount the dvdrw drive:

Code:

root# mount /dev/sr0 /mnt/dvdrw
mount: /dev/sr0 is not a block device
root# ls -l /dev/sg0 /dev/sr0
lr-xr-xr-x  1 root root 36 Aug 21 11:50 /dev/sg0 -> scsi/host0/bus0/target0/lun0/generic
lr-xr-xr-x  1 root root  8 Aug 21 06:48 /dev/sr0 -> /dev/sg0
root# mount /dev/scsi/host0/bus0/target0/lun0/cd /mnt/dvd
mount: block device /dev/scsi/host0/bus0/target0/lun0/cd is write-protected, mounting read-only

Now here is the second problem, when I unplug the dvdrw drive and plug it back in, it no longer recognizes it. If I try unloading (rmmod) either sr_mod or sbp2, rmmod just hangs.

Code:

**AFTER UNPLUGING**
ieee1394: Node changed: 0-01:1023 -> 0-00:1023
ieee1394: Node suspended: ID:BUS[0-00:1023]  GUID[0010100345c4bd87]

***AFTER PLUGING BACK IN***
ohci1394: fw-host0: SelfID received, but NodeID invalid (probably new bus reset occurred): 0000FFC0

So any ideas on how I can get this running smoothly???

wickdgin · 08-21-2004, 01:46 PM

Ok, I recompilled my kernel again... realized I was using devfs, so I changed over to using udev. Booted up with my drive plugged in, recognized it fine. This time sr0 pointed to scd0, and I was able to mount the sr0 device. k3b recognized the drive as well. However it only recognizes any burning devices when run as root, which seems to be a whole other problem.

However, I am still having the same problem if I unplug the drive, and plug it back in. I get the same kernel messages as shown in the previous post, and the device register. Also, rmmod still hangs if I try to remove the sr_mod module.

Anybody??? It seems I always have to answer my own questions

liquidtenmilion · 08-22-2004, 08:40 AM

It's a problem in the 2.6.8 kernel. You can only burn cds as root in 2.6.8, you should switch to 2.6.7 if you want to burn cds.

wickdgin · 08-22-2004, 10:55 AM

Thanks, but is this also the reason for not being able to reconnect the drive???

wickdgin · 08-22-2004, 12:15 PM

I switched to 2.6.7, it does fix the k3b problem. However I still have the problem of reconnecting the drive....

I found that I am able to 'rmmod sr_mod' while the dvdrw is still plugged into the firewire port, if I do that and unplug/replug the drive it will recognize it fine again. If I don't remove the sr_mod module, the drive will not be recognized when it is plugged back in, and 'rmmod -f sr_mod' tells me the modules is busy.

Any suggestions as to a work around on this?