From: Alessandro Suardi <ALESSANDRO.SUARDI@oracle.com>
To: mikpe@csd.uu.se
Cc: linux-kernel@vger.kernel.org
Subject: Re: "Latitude with broken BIOS" ?
Date: Mon, 20 Jan 2003 06:38:14 -0800 (GMT-08:00) [thread overview]
Message-ID: <7622343.1043073494737.JavaMail.nobody@web155> (raw)
Mikael Pettersson wrote:
> On Mon, 20 Jan 2003 04:31:58 -0800 (GMT-08:00), Alessandro Suardi wrote:
> > I was hoping to use HT on my new Latitude C640 (P4 @ 1.8Ghz) but at boot
> > both 2.4.21-pre3 and 2.5.59 (obviously with a SMP kernel) tell me
> >
> > "Dell Latitude with broken BIOS detected. Refusing to enable the local APIC."
> >
> > Is this anything that can be played with ?
>
> First of all, your 1.8GHz mobile P4 doesn't actually have HT.
> The only ones to have it are the new 3.06GHz P4s, and most Xeons.
Ok.
> Secondly, I'm responsible for the message you quoted. Many if not all
> Pentium III-based Dell laptops (including Latitude Cnnn and I8nnn)
> that have local-APIC capable processors fail miserably if the OS
> actually enables it. For instance, pulling or inserting the DC
> power plug would hang the machine. This is a BIOS bug we can't work
> around, except by refusing to enable the local APIC.
>
> Your P4-based Latitude probably has a different BIOS than the buggy
> P3-based ones, and it may work better. Try commenting out the
> local_apic_kills_bios entry for "Dell Latitude" at around line 692
> in arch/i386/kernel/dmi_scan.c and rebuild the kernel. If it
(ahem) I had tried that in 2.5.58 already ;)
However I rebuilt 2.5.59 with that change, and I'm not going further:
No local APIC present or hardware disabled
I have both CONFIG_X86_IO_APIC and CONFIG_X86_LOCAL_APIC=y.
(while I'm using my old PIII/750 the PIV is still okay for testing ;)
Ciao,
--alessandro
next reply other threads:[~2003-01-20 14:34 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-20 14:38 Alessandro Suardi [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-05-23 8:55 "Latitude with broken BIOS" ? Brouard Nicolas
2003-05-23 9:02 ` mikpe
2003-05-23 21:04 ` Brouard Nicolas
2003-05-23 17:41 ` Mark Watts
2003-01-20 15:23 Alessandro Suardi
2003-01-20 15:02 Mikael Pettersson
2003-01-20 14:13 Mikael Pettersson
2003-01-20 13:49 Alessandro Suardi
2003-01-20 13:28 Alessandro Suardi
2003-01-20 13:41 ` Dave Jones
2003-01-20 12:31 Alessandro Suardi
2003-01-20 13:19 ` Dave Jones
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