Hi all,
I'm using ubuntu 7.04 on an hp compaq nx8430 laptop. Sometimes, after the
regular boot, I'm not able to access the cdrom (i.e., the device /dev/scd
does not exists), while after a reboot it appears again. Anyone knows where I
can search for to find a solution to this problem? I'm not able to understand
why and when it is disappearing....
Thanks,
Luca
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01-02-2008, 08:46 PM
"Pär Lidén"
cdrom disappearing
What happens if you eject the disc, and put it back again?
/Pär
2008/1/2, Luca Ferrari <fluca1978@infinito.it>:
Hi all,
I'm using ubuntu 7.04 on an hp compaq nx8430 laptop. Sometimes, after the
regular boot, I'm not able to access the cdrom (i.e., the device /dev/scd
does not exists), while after a reboot it appears again. Anyone knows where I
can search for to find a solution to this problem? I'm not able to understand
why and when it is disappearing....
Thanks,
Luca
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01-03-2008, 06:56 AM
Luca Ferrari
cdrom disappearing
On Wednesday 2 January 2008 Pär Lidén's cat, walking on the keyboard, wrote:
> What happens if you eject the disc, and put it back again?
Nothing at all, even if I try to manually mount or to use k3b the result is
always that the device does not exists!
Luca
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01-03-2008, 11:44 AM
anthony baldwin
cdrom disappearing
Luca Ferrari wrote:
> On Wednesday 2 January 2008 Pär Lidén's cat, walking on the keyboard, wrote:
>
>> What happens if you eject the disc, and put it back again?
>>
>
> Nothing at all, even if I try to manually mount or to use k3b the result is
> always that the device does not exists!
>
> Luca
>
>
Do y'all suppose his fstab or mtab cuold be missing an entry to his
cdrom drive?
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01-03-2008, 06:32 PM
Corey Bettenhausen
cdrom disappearing
Luca Ferrari wrote:
> Hi all,
> I'm using ubuntu 7.04 on an hp compaq nx8430 laptop. Sometimes, after the
> regular boot, I'm not able to access the cdrom (i.e., the device /dev/scd
> does not exists), while after a reboot it appears again. Anyone knows where I
> can search for to find a solution to this problem? I'm not able to understand
> why and when it is disappearing....
I have a Compaq V4000 that does something similar. The OS (either Linux
or Windows) will not recognize the DVD drive unless there is a disk in
the drive at boot. I'm not sure if it's a hardware or software issue.
I've worked around it by simply rebooting whenever I needed to use the
drive. Luckily, I don't use the drive all that often...
-Corey
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01-07-2008, 10:32 AM
"Pär Lidén"
cdrom disappearing
It is quite strange that it works sometimes, and other times not. I had a strange problem where the system would sometimes hang while logging in. I was able to workaround this by disabling hyperthreading in the bios. You could try disable hyperthreading, or dual-core functionality if you have that. If that helps, you could report this as a bug in launchpad.
Cheers
Pär
2008/1/3, Luca Ferrari <fluca1978@infinito.it>:
On Wednesday 2 January 2008 Pär Lidén's cat, walking on the keyboard, wrote:
> What happens if you eject the disc, and put it back again?
Nothing at all, even if I try to manually mount or to use k3b the result is
always that the device does not exists!
Luca
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01-07-2008, 03:56 PM
Luca Ferrari
cdrom disappearing
On Thursday 3 January 2008 anthony baldwin's cat, walking on the keyboard,
wrote:
> Do y'all suppose his fstab or mtab cuold be missing an entry to his
> cdrom drive?
Uhm..not sure to understand what you mean. The fstab file is "static", and
thus reports the entry for /dev/scd each time the machine boots. What happens
is that the device disappears......I guess it is a problem with the hardware
recognition, but I'm sure the cdrom is working fine (each time I boot in
Windows I can see it, and each time I can see it in linux it works fine, both
in read/write).
Any idea?
Thanks,
Luca
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01-07-2008, 04:22 PM
Derek Broughton
cdrom disappearing
Luca Ferrari wrote:
> On Thursday 3 January 2008 anthony baldwin's cat, walking on the keyboard,
> wrote:
>> Do y'all suppose his fstab or mtab cuold be missing an entry to his
>> cdrom drive?
>
> Uhm..not sure to understand what you mean. The fstab file is "static", and
> thus reports the entry for /dev/scd each time the machine boots. What
> happens is that the device disappears.....
Well, devices _always_ disappear. In days of yore, devices got created
in /dev and stayed there. Now udev creates them every time you boot. I'm
assuming that the device isn't disappearing except at boot time - but
that's not 100% certain from your post.
> .I guess it is a problem with
> the hardware recognition, but I'm sure the cdrom is working fine (each
> time I boot in Windows I can see it, and each time I can see it in linux
> it works fine, both in read/write).
I expect you're right. You might try:
# sudo /etc/init.d/dbus restart
and see if hal finds it the next time it runs. You should copy the output
of "lsmod" while the device is missing, and compare it to the output from
lsmod when the device is present, and see what modules are missing.
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derek
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01-16-2008, 06:53 AM
Luca Ferrari
cdrom disappearing
On Monday 7 January 2008 Derek Broughton's cat, walking on the keyboard,
wrote:
>
> # sudo /etc/init.d/dbus restart
>
> and see if hal finds it the next time it runs. You should copy the output
> of "lsmod" while the device is missing, and compare it to the output from
> lsmod when the device is present, and see what modules are missing.
It worked fine for a few days, and today the cdrom disappeared again. I've
tried to restart dbus but nothing changed. The following is the lsmod output
while the cdrom is missing:
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01-16-2008, 05:18 PM
Derek Broughton
cdrom disappearing
Luca Ferrari wrote:
> On Monday 7 January 2008 Derek Broughton's cat, walking on the keyboard,
> wrote:
>>
>> # sudo /etc/init.d/dbus restart
>>
>> and see if hal finds it the next time it runs. You should copy the
>> output of "lsmod" while the device is missing, and compare it to the
>> output from lsmod when the device is present, and see what modules are
>> missing.
>
> It worked fine for a few days, and today the cdrom disappeared again. I've
> tried to restart dbus but nothing changed. The following is the lsmod
> output while the cdrom is missing:
>
...
>
> Any idea about this?
Yeah - diff the outputs and see what's changed.
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cdrom disappearing
