Problems with 2.6.7-mm1 on HP Omnibook 6100

[Martin Knoblauch]

Hi,

 after going from 2.6.6-mm5 to 2.6.7-mm1, I see the following problems.

a) System hangs at boot. Local APIC related. This is a known problem on
the OB, but could be avoided by specifying "nolapic" in 2.6.6-mm5. With
2.6.7-mm1 I have to specify "acpi=off", or apply the following patch
from Len:

--- 1.53/arch/i386/kernel/apic.c        Tue Mar  2 22:06:19 2004
+++ edited/arch/i386/kernel/apic.c      Sat Apr 24 01:14:59 2004
@@ -654,6 +654,7 @@
        }

        if (!cpu_has_apic) {
+printk("LENB: !cpu_has_apic\n");
                /*
                 * Some BIOSes disable the local APIC in the
                 * APIC_BASE MSR. This can only be done in
@@ -661,6 +662,8 @@
                 */
                rdmsr(MSR_IA32_APICBASE, l, h);
                if (!(l & MSR_IA32_APICBASE_ENABLE)) {
+printk("LENB: NOT reenabling LAPIC\n");
+goto no_apic;
                        printk("Local APIC disabled by BIOS --
reenabling.\n");
                        l &= ~MSR_IA32_APICBASE_BASE;
                        l |= MSR_IA32_APICBASE_ENABLE |
APIC_DEFAULT_PHYS_BASE;

  Interestingly, "nolapic" still makes a difference when Lens patch is
not installed. Without it, the boot process hangs at the same place as
in 2.6.6/2.6.6-mm5 - just after these lines in dmesg:

>>>
ACPI: Subsystem revision 20040326
ACPI: IRQ9 SCI: Edge set to Level Trigger.
    ACPI-0179: *** Warning: The ACPI AML in your computer contains
errors, please nag the manufacturer to correct it.
    ACPI-0182: *** Warning: Allowing relaxed access to fields; turn on
CONFIG_ACPI_DEBUG for details.
<<<

 With "nolapic" it now hangs after the following output:

>>>
Checking if this processor honours the WP bit even in supervisor
mode... Ok.
Calibrating delay loop...
<<<

 It never displays the Bogomips.

b) The system does not shut down (or reboot) any more. The last output
is:

ISDN-subsystem unloaded

 Sometimes CTRL-ALT-DEL helps to bring the system down, sometimes I
just have to reset it.


 So, it seems that 2.6.7-mm1 is not the most lucky of all releases. I
have not tested 2.6.7 vanilla. I would "prefer" not to, as the Onmibook
is dog slow compiling kernels :-(

 "dmesg" (with lens patch) and ".config" attached.

Cheers
Martin

=====
------------------------------------------------------
Martin Knoblauch
email: k n o b i AT knobisoft DOT de
www:   http://www.knobisoft.de

Attachment: dmesg-2.6.7-mm1
Description: dmesg-2.6.7-mm1

Attachment: .config
Description: .config