From: Mikael Pettersson <mikpe@csd.uu.se>
To: arysin@myrealbox.com, linux-kernel@vger.kernel.org
Subject: Re: turning off APIC
Date: Mon, 16 Sep 2002 03:28:53 +0200 (MET DST) [thread overview]
Message-ID: <200209160128.DAA04146@harpo.it.uu.se> (raw)
On Sun, 15 Sep 2002 14:28:44 +0300, Andriy Rysin wrote:
>If APIC is compiled in the kernel (wich is the case with most
>distributions) when I start kernel with "noapic" option, APIC is getting
>enabled anyway and only later gets disabled. This causes problems on
>some VAIO notebooks - it seems like BIOS gets confused if APIC was
>turned on (particularly on my laptop when I try to reboot from Linux it
>hangs saying that thera problems with keyboard). That would be much
>better to have an option to turn it off in the boot options and not to
>recompile the kernel. Could somebody comment this please?
>Please CC me on this email address.
Which APIC? local or I/O? Please be specific.
"noapic" does not and never has had anything to do with the
local APIC, only the I/O APIC. There is currently no kernel
option for preventing the local APIC from being enabled if
the kernel was built with local APIC support.
You have four options:
1. Recompile with CONFIG_SMP=n and CONFIG_X86_LOCAL_APIC=n.
2. Run dmidecode on your Vaio, dig out the identification strings,
and add them to arch/i386/kernel/dmi_scan.c's local APIC
blacklist.
3. Add a __setup in arch/i386/kernel/apic.c after the declaration
for dont_enable_local_apic, which sets it to 1.
4. Tell Sony to fix the Vaio's BIOS.
/Mikael
next reply other threads:[~2002-09-16 1:23 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-16 1:28 Mikael Pettersson [this message]
2002-09-16 12:15 ` Maciej W. Rozycki
-- strict thread matches above, loose matches on Subject: below --
2002-09-16 19:53 Andriy Rysin
2002-09-15 11:28 Andriy Rysin
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