Re: CD/DVD drive not recognized.

On Tue, 2007-10-09 at 17:48 +0200, Nigel Henry wrote:
On Tuesday 09 October 2007 15:06, Simon Slater wrote:
On Mon, 2007-10-08 at 19:15 +0200, Nigel Henry wrote:
Hi Simon. This is probably no help whatsoever, but a bit of googling
brought up the same problem for Fedora 7 on fedora forum from about 3
months ago.

Someone there found that FC6 picked up their optical drive ok, but F 7
didn't. Also someone found that an i686 kernel, version 2.6.21-1.3255.fc7
picked up the optical drive ok (that was a testing kernel at the time),
whereas the earlier kernel didn't. The original kernel from my install
cdroms for Fedora 7 is 2.6.21-1.3228.

What is your current kernel? Is Fedora 7 fully updated?

I was stupidly going to suggest you tried a live cdrom, to see if the
drive was accessible afterwards. Doh. Not so easy with only one optical
drive.

2¢ worth of probably useless info

Nigel.

All info gladly taken on board, Nigel. The drive worked with boot.iso
CD where I did an NFS install (see an earlier thread). The Fedora 7 DVD
was purchased. I have not run yum update yet. It can take a long time
on dialup.

I know the feeling, as I too am on dialup. IIRC the updates are about 800MB,
but doesn't take as long as downloading the 5 cdrom iso's for Fedora 7 that
someone kindly made available (8-10 days).

GRUB menu shows:
Fedora (2.6.20-2925.9.fc7xen)
and Fedora-base (2.6.21-1.3194.fc7)

This problem happens when booting to either. On our system I would
retain the Xen kernel to play with virtualization, but on the system
that I'm setting up the base kernel is all that is needed.

You see that could well be the problem, as your kernel is even earlier than my
original one (3228), and the guy on the fedora forum got his drive detected
using a 3255 one, which was a testing kernel at the time.

I've just tried my earliest 3228 kernel, and the optical drive is detected ok,
but when I went to install Fedora 7 on the same machine that has FC1,2,3,4,
and 5 on it, along with Debian installs, etc, it wouldn't boot on my new
combi optical drive, although live cdroms, booted ok, and I also put the
first disk in for FC5, and that booted ok. I had to use smart boot manager on
a floppy disc to get the first disc for Fedora 7 to boot.

Based on what I've seen on various lists, combination drives create more
problems than a drive dedicated to a specific format, and different
makes/models of the combo drives appear to compound the problem. Some just
work, others don't, but that's no help to the end user though.



I have deliberately avoided toying with different kernels, or even
updating the kernel for that matter, until my knowledge of Linux grows
some more. I still haven't got ftape working with FC6 yet, it needs
kernel modules being compiled as I recall. I suppose that I don't need
to now with the new DVD burner.

I'll have a closer look on Fedora Forum, thanks.
This is the one that I found using, optical drive not detected on Fedora7 as a
search on google.
http://forums.fedoraforum.org/showthread.php?t=160361

It is the first on the list, but thought the possible kernel related problem
was worth posting to you.

--
Regards
Simon

Regarding kernel updates and Yum:

I use Apt, and Synaptic for updates, and all kernels are saved, but if you are
using Yum, it only keeps 2 kernels as default. Personally I don't like that,
and prefer to decide myself as to how many kernels I want available.

You can change the way that Yum deals with kernels though, but Yum has been
updated on Fedora 7, so the place to edit has changed.

Originally this was in /etc/yum/pluginconf.d, and a file named
installonlyn.conf existed. By default there are the following 2 lines.
enabled=1
tokeep=2
The first enables the plugin, and the second, how many kernels to keep.

Even though I don't use Yum, I always edit the file, and set the first line as
enabled=0, thus saving all kernels.

Some updates later on Fedora 7, Yum itself is updated, and what I've written
above no longer applies.

As I've said, I don't use Yum, but to make sure you keep all kernels after the
yum package has been updated, you need to add a line to /etc/yum.conf as
below. ( I put it after the metadata line)

installonly_limit=0
That's a zero, not an uppercase o.

Apologies for rambling on about kernels. I just don't like my kernels being
trashed by updates.

Nigel.

As I said, I know very litle about the kernel side of things so feel
free to ramble. I guess my kernel lerning starts now.


--
Regards
Simon


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