[ale] Karmic failure - missing device - mknod

[wolf at wolfhalton.info]

Does it work from the live disk?
I had a similar failure with my sound card on 9.10
1.  I did an upgrade over the wire, which had always worked great with
Ubuntu before.
   1.1 Sound fails - card is seen by the system but not seen by
pulse-audio or any other GUI-side utility
2. Burned an iso of Ubuntu.
   2.1 Bare-metal install 
   2.2 Sound failed (same apparent issue as 1.
3. Worked it over at the Install Fest with wiser help.  
   3.1 The issue seemed to be that the installer program was jacked up,
and not able to set the mods right
   3.2 There were different link numbers to the kernel modules related
to this bit of hardware. Found with lsmod in live and installed
sessions.
4. Installed Kubuntu (clean install) 
   4.1 The sound card was automagically available for use.
   4.2 The modules had the same linkages as they did from a session off
of the live disk
What's different?  Mine was an HP dv6000 laptop.  Apparently, lots of
people were having trouble with this model and sound.
What doesn't work now?  My hp multimedia button-bar at the top of the
keyboard is not rigged up in Kubuntu.  It is still limping because of
that.

You might be able to look at kernel modules related to the DVD drive.
Since the previous version worked, it would make sense that there was a
similar issue for your situation as for mine, though it is a different
kind of hardware.

-Wolf

This was something I hadn't seen for listing hardware lshw. 
http://embraceubuntu.com/2007/02/18/find-hardware-specs-details-on-your-computer/ 


-----Original Message-----
From: Grady Harris <nolan.voight at gmail.com>
Reply-to: Atlanta Linux Enthusiasts - Yes! We run Linux! <ale at ale.org>
To: Atlanta Linux Enthusiasts <ale at ale.org>
Subject: [ale] Karmic failure - missing device - mknod
Date: Mon, 21 Dec 2009 09:58:02 -0500


Another newsletter from the Slow Learners Academy:

I finally upgraded my Ubuntu installation to 9.10 lasty week, figuring
enough time had passed for others to have worked out most problems.
Not so--the thing doesn't know the machine has a DVD drive in it. Pop
in a disk, nothing happens. Click on the cdrom icon that appears in
Nautilus, get the message that no such device exists. Try it different
ways, get variations on the message: "/dev/scd0 does not exist,"
"/dev/sr0 does not exist." I check, sure enough, it doesn't exist. My
first thought is, "Well, then, I'll make it."

 I spent a long while Saturday looking on the Ubuntu forums &
elsewhere for folks having the same problem, & there were many. Lots
of other folks being helpful, but none of the tips worked for me. They
all seemed to be predicated upon the device being there, & it wasn't.
Okay, blunt object time. I made /dev/sr0 w/ touch, changed the group,
set the permissions, created a symbolic link to /dev/scd0, & it
worked. However, comparing it with the other files in dev, noticed it
should be a block file.

Haven't done that before. Is mknod what I should use to create the
device file? Is there a preferred way?
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