[Bugme-new] [Bug 10784] New: AMD64 laptop hangs after logging powernow-k8 error while on battery.

bugme-daemon at bugzilla.kernel.org bugme-daemon at bugzilla.kernel.org
Fri May 23 19:24:54 PDT 2008


http://bugzilla.kernel.org/show_bug.cgi?id=10784

           Summary: AMD64 laptop hangs after logging powernow-k8 error while
                    on battery.
           Product: Platform Specific/Hardware
           Version: 2.5
     KernelVersion: 2.6.25
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: x86-64
        AssignedTo: platform_x86_64 at kernel-bugs.osdl.org
        ReportedBy: jason at jasonjgw.net


Earliest failing kernel version: not known, first noticed on 2.6.22
Distribution: Debian
Hardware environment: AMD Athlon64 laptop
Problem Description: When this laptop is run on battery, the following error
is logged:

May 23 15:55:41 jpc kernel: [   38.255997] powernow-k8: error - out of sync,
fix 0x8 0x0, vid 0x6 0x12

Under kernel versions 2.6.22 and 2.6.24, the system eventually hangs,
displaying the above error on the console. Under kernel 2.6.25, the hang has
so far occurred only during shutdown (prior to unmounting file systems). I can
carry out more testing if necessary.

Since I don't run this laptop frequently on battery, I don't know when the
problem was introduced; it was probably after the 2.6.18 kernel at some point,
and definitely before 2.6.22. The laptop has worked on battery in the past
with the 2.6 kernel series and powernow-k8 loaded.

Steps to reproduce:

1. Load the powernow-k8 module (in my case, this happens during boot as I have
selected the ondemand CPU frequency governor).

2. Run the machine on battery rather than from AC power.

History of bug: detected and tested with Debian kernels, reported as Debian
bug 464664:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=464664
Debian kernel maintainers requested that it be reported upstream (see the Web
page cited above) after it was found to occur with the latest Debian 2.6.25
kernel release.

/proc/cpuinfo:

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 4
model name      : AMD Athlon(tm) 64 Processor 3000+
stepping        : 10
cpu MHz         : 800.000
cache size      : 1024 KB
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext lm 3dnowext 3dnow up
rep_good
bogomips        : 1597.95
TLB size        : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp

I also notice the following, which may or may not be related:
modprobe acpi
Error inserting acpi_cpufreq (/lib/modules/2.6.25-2-amd64/kernel/arch/x86
/cpu/cpufreq/acpi-cpufreq.ko): Device or resource busy


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