Comment 30 for bug 193125

 I found the Message on the Linux Kernel 2.6.27.5 ChangeLog

   The current snd-hda-intel driver seems blocking the power-off on some
    devices like eeepc. Although this is likely a BIOS problem, we can add
    a workaround by disabling IRQ lines before power-off operation.
    This patch adds the reboot notifier to achieve it.

It is good new ,though I can't confirm that my notebook cause by the bug

Let me waitting for .

2008/11/8 Buckminster <email address hidden>

> As I said above:
> I installed kubuntu 8.10 and then the error came up. In the versions from
> 6.10 to 8.04 it never came up.
>
> I never had an error like that. Perhaps the reason is another as on your
> machine.
>
> Frank
>
> --
> halt：unable to iterate IDE devices:no such files or directory
> https://bugs.launchpad.net/bugs/193125
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in "linux" source package in Ubuntu: New
>
> Bug description:
> lsb_release -a
>
> No LSB modules are available.
> Distributor ID: Ubuntu
> Description: Ubuntu 7.10
> Release: 7.10
> Codename: gutsy
>
>
> I've looked all over the place for this one, but can't find a solution. One
> answer said to add acpi=off, which I did - no change.
>
> I recently installed Kubuntu 7.10 on my IBM T20 laptop. With all the other
> distros I've thrown at this platform, none have ever failed to properly
> shutdown and power off. Except for now.
>
> In Kubuntu I've gone to System Settings -> Advanced -> System
> Administration -> Login Manager -> Shutdown tab (in Administrator mode).
> I've tried the /sbin/ shutdown, /sbin/stop, /sbin/poweroff, and /sbin/halt
> entries for the Shutdown dropdown box. In all cases when I select "Turn Off"
> from the logoff menu selection, the GUI shuts down fine, and all the runs
> are properly terminated, killed, etc. The message "Will now halt" is
> displayed, but instead of powering off another error type message is
> displayed that states "halt: unable to iterate IDE devices: no such file or
> directory". this is followed by the message "System halted". The system goes
> quiet, but the power light is still on and the screen still has a display of
> the last messages. At this point I can press the power button and the power
> does go off.
>