disabling both CONFIG_SMP and CONFIG_X86_UP_APIC fixed the
suspend/resume problem. I haven't confirmed whether or not
CONFIG_X86_UP_APIC alone brings back the problem -- will let you know.
the dmi settings are:
DMI 2.3 present.
DMI table at 0x000E0010.
/proc/cpuinfo comes up as:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 6
cpu MHz : 696.980
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov
pat pse36 mmx fxsr sse
bogomips : 1389.36
thanks for all your help.
-Matt
On Mon, 2002-02-04 at 20:07, Mikael Pettersson wrote:
> On Sun, 03 Feb 2002 12:18:50 -0500, Matt <mjg23@yahoo.com> wrote:
> >I have a Thinkpad T20 and have been using a hand-built 2.4.5 kernel for
> >some time. Recently, ever since I got a USB scanner and camera, I've
> >been experiencing spurious machine hangs. I read on one of the lists
> >that there was a bug in the USB core that sounded related so I tried to
> >upgrade.
> >
> >Everything works ok with the stock 2.4.17 kernel (except the addition of
> >the pcmcia-cs pacakge version 3.1.31) I built except that "apm -s" and
> >then resume causes the machine to hang. On resume, even outside of X,
> >the screen blanks or appears but doesn't respond to keyboard input. No
> >oops, no messages, no nothing. The only choice I have at that point is
> >a hard reset.
> >
> >I just tried the 2.5.3 beta kernel and had the same problem.
> >
> >Please let me know if there's anything else I can do to help diagnose
> >the problem and/or workaroound it. I'll include my .config file in case
> >that helps.
> >
> >Thanks and keep up the great work.
> >-Matt
> >...
> >CONFIG_SMP=y
>
> CONFIG_SMP could actually trigger the problem. Since about 2.4.10,
> the kernel will try to enable and use the processor's "local APIC"
> (a built-in interrupt controller) if CONFIG_SMP _or_ CONFIG_X86_UP_APIC
> is enabled. Unfortunately, some machines have crap BIOSen that break
> this feature. The Dell Inspiron is the standard example of this,
> but the T20 might also be affected.
>
> Does /proc/cpuinfo list the "apic" feature flag?
>
> If so, does disabling CONFIG_SMP and running a normal UP kernel
> eliminate the hangs?
>
> If a plain UP kernel works, does UP with CONFIG_X86_UP_APIC
> reintroduce the hangs?
>
> If all this is true, then it's a safe bet that your BIOSs (actually
> the "SMM" part of it) can't handle an enabled local APIC. I'm
> working on a patch for this: could you edit arch/i386/kernel/dmi_scan.c,
> change the #define dmi_printk(x) to use printk instead of being
> empty, reboot, and send me the DMI strings printed during boot?
>
> /Mikael
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This archive was generated by hypermail 2b29 : Thu Feb 07 2002 - 21:00:46 EST