Bug 58494 - box hangs on poweroff when smp kernel is used
Summary: box hangs on poweroff when smp kernel is used
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: kernel
Version: 7.2
Hardware: i686
OS: Linux
Target Milestone: ---
Assignee: Arjan van de Ven
QA Contact: Brian Brock
Depends On:
TreeView+ depends on / blocked
Reported: 2002-01-18 03:19 UTC by m-herron
Modified: 2007-04-18 16:39 UTC (History)
1 user (show)

Clone Of:
Last Closed: 2003-06-08 00:25:16 UTC

Attachments (Terms of Use)

Description m-herron 2002-01-18 03:19:51 UTC
From Bugzilla Helper:
User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows 98; MSOCD)

Description of problem:
I have a RH 7.2 box.  It has all the latest patches, including the latest 
kernel.  When I am running the smp kernel, the machine hangs when I try to shut 
it down.  Namely, I get the "Power Down" message and then it hangs.  This 
happens even when apm is not running (which it never does on my workstation).  
It never happens when I run the single processor kernel.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1.Boot machine with smp kernel
2.log in
3.poweroff or shutdown -h now

Actual Results:  The machine hangs at "Power Down."  Then I turn it off by hand 
(not a good solution!)

Expected Results:  The machine should have turned off itself.

Additional info:

THe machine is a Dell Precision 530 with 2 xeon 1.7g processors.

Comment 1 Arjan van de Ven 2002-01-18 18:08:35 UTC
Ah. Automatic poweroff is disabled by default on SMP machines because power off
requires APM bios services, and the 1) vast majority of SMP bios writes don't
know how to spell APM and 2) APM is not SMP safe by design.

There is an override where you can tell the kernel that you trust your bios,
just append the text


to the "vmlinuz" line in the /boot/grub/grub.conf

Comment 2 m-herron 2002-01-21 20:53:53 UTC
Sorry, but this did not work.  The machine still hangs when you add the line you suggested to grub.conf


Comment 3 John Bage 2002-07-02 20:53:09 UTC
I am having the same problem using KDE and Grub on RedHat Linux 7.3. I have 
even tried to do all the updates and even a complete reinstall of it but with 
no luck. It still continues to do this. I have also tried the bigmem, smp, and 
the regular kernels and the same problem still continues.

Comment 4 Alan Cox 2003-06-08 00:25:16 UTC
If the BIOS lacks APM power off then we can't do anything about it

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