On Fri, Dec 23, 2011 at 05:18:47PM GMT, Ed Jabbour wrote:
> CDROM tray will not respond to "eject":
> ========================
> [Fri Dec 23] edj:~$ eject
> eject: tried to use `/media/cdrom0' as device name but it is no block device
> eject: tried to use `/dev/scd0' as device name but it is no block device
> eject: unable to find or open device for: `cdrom'
> =========================

Which device is you optical drive?

> Perhaps related, dmesg reveals:
> ==============================
> 6.720030] ata1: link is slow to respond, please be patient (ready=0)
> [   11.704028] ata1: device not ready (errno=-16), forcing hardreset
> [   16.900028] ata1: link is slow to respond, please be patient (ready=0)
> [   21.716029] ata1: SRST failed (errno=-16)
> [   26.912027] ata1: link is slow to respond, please be patient (ready=0)
> [   31.728027] ata1: SRST failed (errno=-16)
> [   36.924030] ata1: link is slow to respond, please be patient (ready=0)
> [   66.772029] ata1: SRST failed (errno=-16)
> [   71.800028] ata1: SRST failed (errno=-16)
> [   71.811047] ata1: reset failed, giving up
> [   71.811185] ata2: port disabled--ignoring
> =============================

Might be related, see below.

> modprobe cdrom sr_mod:
> ==============================
> FATAL: Error inserting cdrom (/lib/modules/3.1.0-1-686-
> pae/kernel/drivers/cdrom/cdrom.ko): Unknown symbol in module, or unknown 
> parameter (see dmesg)

You're trying to load two modules (cdrom and sr_mod) and modprobe treats
the second one as a parameter to the first one.
You should load modules one by one.

> 728.919036] cdrom: Unknown parameter `sr_mod'

Which part of the above message is not clear? ;^)

> Nor will the tray open manually, except that it does if on reboot, I push the 
> button before GRUB takes over.   Running testing with the 3.1.0-1-686-pae  
> kernel, although the problem persists no matter which kernel I boot into.
> 
> Any advice, pointers, etc. appreciated.

The above dmesg messages might point to faulty drive or cable.
Does the optical drive work at all, e.g. under another OS?

Regards,
-- 
Raf


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