Solved

Linux Apic

Posted on 2011-02-17
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Last Modified: 2012-05-11
Hi guys,

I have a fresh installation of Fedora 14 64b. I have tried pretty much distributives and finally my choice is Fedora. I have an Asus M4A89GTD Pro /usb3 mobo and If APIC is enabled in my BIOS I can't turn off my machine, I mean procedure is normally running and I can see that all services are stopped but there is no automatic PSU turn off.

If I disable APIC I can normally turn off my machine but from CPU information I see only 1 available core instead of 4. I have googled this problem pretty much time but there is no usful information. At this time my workaround is sleeping mode which is working fine with or without APIC option. The reason why I offer 500 points for this issue resolution is just because this is very important for me to resolve and during huge amount of time I couldn't find out normal solution. If somebody have an idea, please help!

Many thanx,
Alex
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Question by:NiconPhantom
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Expert Comment

by:jlevie
ID: 34921594
Have you checked to see if your system board BIOS is the latest version?
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Author Comment

by:NiconPhantom
ID: 34924131
Hi, sure.... I have the last version of BIOS.
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Accepted Solution

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NiconPhantom earned 0 total points
ID: 34924142
I don't know where is the logic, but today I have installed Arch linux instead of Fedora, and I was shocked after my PC has been normally turned off with Arch :-) I think that diference can be in kernel version, Arch always offer new versions of kernels and other stuff little bit faster than another distributives. At this moment as I got positive result and my system is working fine, we can close this question.
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Expert Comment

by:HappyCactus
ID: 34924778
Just to explain why you solved, you must enable the "loapic" option on boot, since (as you can read from the kernel documentation) loapic is used to manage the interrupts for power management and SMP management of interrupts. without loapic the kernel can't run in a SMP mode, so no more than 1 core.
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Author Comment

by:NiconPhantom
ID: 34924991
Happy Cactus, thank you for reply, actually after installation, suggested by you loapic flag has not been manually specified by me. At this time I use APIC enabled Bios setting and absolutely defaul Kernel 2.6.37-6 without any additional flag. It is very interesting because as far as I remeber I have tried Arch last time with ~2.6.35 Kernel but without successful poweroff. Here is my original comment on Arch BBS: https://bbs.archlinux.org/viewtopic.php?id=104124
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LVL 12

Expert Comment

by:HappyCactus
ID: 34925045
Maybe something was changed in the chipset driver - you should check the changelog, very difficult to say.
loapic is an option that "should" by set by default, since enabling it on uniprocessor it's (where no loapic is present) doesn't make any difference.

In any case, I would check (with diff -ub) the different kernel configuration.
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Author Comment

by:NiconPhantom
ID: 34937418
Thank you very much HappyCactus for detailed description! Next time if I'll use other distro with older Kernel, I'll follow your suggestion.
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Author Closing Comment

by:NiconPhantom
ID: 34949992
New distro, newer version of kernel, I think that that is the solution. I have tried Arch before, maybe 6 months ago but result was the same. So, Arch + 2.6.37-5 is solution of my problem.
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