Incomplete shutdown on some LTSP clients (shutdown hangs/freezes)

[Phill Whiteside]

Hi John,

I've asked on the ltsp team. I do not think it is a lubuntu issue, nor an
edubuntu one, but a generic issue.

I have cc'd this to the guy who looks after general QA, I'm sure that he
will chase it up for you.

For your information LTSP are at [1].

Regards,

Phill.
1. https://help.ubuntu.com/community/UbuntuLTSP/

On 25 August 2012 19:31, John Hupp <lubuntu at prpcompany.com> wrote:

>  On my Lubuntu and Edubuntu 12.04 LTSP test networks, I find that some
> clients do not shut down completely.
>
> On the Lubuntu network, one eMachine client stops at a black-and-white
> text screen that says:
>     Ubuntu 12.04
>     .... * Asking all remaining processes to terminate ...
>     [255.161402] SysRq : Power off
>     [255.173722] Power down.
>                                                                       [OK]
>     [255.280060[ SysRq : Power Off
>     [255.280220] Power down.
>     * All processes ended within 1 seconds ....    [OK]
> A simple press of the power button does not turn off the machine at that
> point.  I have to press and hold it 5 seconds or so.
>
> Also on the Lubuntu network, an HP stops at the same screen, but a simple
> press of the power button turns it off.
>
> A Dell on the Lubuntu networks shuts off cleanly and completely within a
> few seconds.
>
> ---------------------
>
> On the Edubuntu network, all clients have to invoke Shutdown from the
> desktop and from the login screen.  After choosing Shutdown from the
> desktop (and then presenting a dialog for Shutdown or Restart), it drops
> back to the login screen, and there one chooses Preferences: Shutdown.
> [Very tedious, but that's not my real interest in this post.  And as a
> footnote, the server shuts down cleanly after the two clicks on the desktop.
>
> But regarding specific client machine behavior on the Edubuntu network,
> the above eMachine hangs at a black screen after Preferences: Shutdown from
> the login screen.  I forgot to make a note of whether a simple press of the
> power button shuts it off from here, or whether a press-and-hold was
> required as it was on the Lubuntu net.
>
> The above HP hangs at a white screen after Preferences: Shutdown from the
> login screen.  A simple press of the power button shuts it off from here.
>
> The above Dell shuts down cleanly after Preferences: Shutdown from the
> login screen.
>
> ---------------------
>
> One other behavior that was of interest to me but that I did not
> thoroughly document was that even on machines where Shutdown hangs, it
> seems generally to be the case that Restart does not hang.  The machine
> proceeds smoothly to POST and reboot.
>
> ---------------------
>
> So I am wondering if I can get all the clients to shut down cleanly via
> the interface Shutdown commands.
>
> If not, is there a script that will produce a clean shutdown?
>
> Or failing that, can I insert a splash screen at the end of the shutdown
> process something like Windows 95/98 used on machines where it could not
> execute a complete shutdown automatically?  (The screen said something like
> "It is now safe to turn off your computer.")
>
> Speaking of Windows 95/98's shutdown process, I recall that the issue had
> to do with power management drivers not fully supporting the hardware on
> some motherboards, or not finding the hardware that power management did
> fully support.  But beyond that, it was possible to
> not-install/uninstall/disable power management on machines that did support
> full shutdown, then install/reinstall/re-enable power management but not
> recover the ability to do a full shutdown.  So it wasn't always just a
> question of supported hardware.
>
> Also regarding Win 9x, that splash screen may have been an integrated part
> of all shutdowns.  I recall seeing it flash on-screen for a split second
> even on machines that were on their way to a full automatic shutdown.
>
>
>
>
>
>
>
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