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SubjectRe: Kernel 2.5.55 failed to boot with ACPI support
Hi!

On Sun, Jan 12, 2003 at 04:51:27PM -0800, Alessandro Suardi wrote:
> Dominik Brodowski wrote:
>
> > On Mon, Jan 13, 2003 at 12:04:02AM +0100, Alessandro Suardi wrote:
> > > Andrew Grover wrote:
> > >
> > > > > From: Ole J. Hagen [mailto:olehag_2001@yahoo.no]
> > > > > I just wanted to inform that kernel-2.5.55 failes to boot
> > > > > when ACPI support is
> > > > > compiled in the kernel.
> > > > >
> > > > > I have following configuration; Dell Optiplex GX-240, Pentium
> > > > > 4 (1.5 GHz), ATI RAGE 128.
> > > >
> > > > How exactly does it fail?
> > >
> > > My brand new Dell Latitude C640 oopses on boot in 2.5.56 if I
> > > have CPU_FREQ config'd in. ACPI without CPU_FREQ is okay - well,
> > > it screws my framebuffer screen (what 2.4.21-pre3 doesn't) when
> > > the ACPI code does its bootup printk's, but after that the
> > > screen recovers.
> > >
> > > ...
> > >
> > > Back on topic, if you're interested I can rebuild my 2.5.56 with
> > > CPU_FREQ and write down the backtrace of the oops.
> > Would be great if you could do that - and tell what oops it is (NULL pointer
> > dereference etc.), in case you still see that on your screen.
>
> Sigh :(
>
> Rebuilt with CPU_FREQ, doesn't oops.

:)

> It says
>
> cpufreq: Intel(R) SpeedStep(TM) for this processor not (yet) available
>
> Is the above message expected ? The CPU is a 1.8Ghz mobile P4.

2.5.56, you say... let me check... yep, then this patch is missing (it's in
2.5.56-bk). Could you send me a /proc/cpuinfo, please? Especially if this
patch doesn't work :)

Dominik

diff -ruN linux-original/arch/i386/kernel/cpu/cpufreq/speedstep.c linux/arch/i386/kernel/cpu/cpufreq/speedstep.c
--- linux-original/arch/i386/kernel/cpu/cpufreq/speedstep.c 2003-01-10 21:55:28.000000000 +0100
+++ linux/arch/i386/kernel/cpu/cpufreq/speedstep.c 2003-01-10 22:13:33.000000000 +0100
@@ -447,7 +447,7 @@
if (c->x86_model != 2)
return 0;

- if (c->x86_mask != 4)
+ if ((c->x86_mask != 4) && (c->x86_mask != 7))
return 0;

ebx = cpuid_ebx(0x00000001);


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