[Bug 16046] New: Processor sometimes locked at 800 Mhz, random, both with and without powernowd

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Ubuntu | linux-meta

           Summary: Processor sometimes locked at 800 Mhz, random, both with
                    and without powernowd
           Product: Ubuntu
           Version: unspecified
          Platform: Other
        OS/Version: other
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: linux-meta
        AssignedTo: debzilla at ubuntu.com
        ReportedBy: ernstp at gmail.com
         QAContact: kernel-bugs at lists.ubuntu.com


Sometimes when I boot, the processor is locked at 800 MHz.
This bascially has two scenarios.

Powernowd enabled: Sometimes when I boot, the processor is stuck in 800 MHz. CPU
frequency scaling is enabled,
all three states (800, 1800 and 2000) are avaliable, but powernowd won't switch
between them.
Usually observing this with gnome-cpufreq-applet.
This is really random. You can boot, be without the problem, reboot, have the
problem, reboot again, and it's gone.

I blamed powernowd for this first, and filed a bug in which I wrote that it was
hard to disable powernowd
and removing it left me at 800 MHz.
But this is probably just a second case of the same bug.
Because after rebooting with powernowd disabled a few times, the processor
actually stuck at 2 GHz.

Where could this bug be? And of cource, how to solve?
Since the bug appears randomly I can't give readouts of everything right now,
but I'll try to reproduce it!

Breezy Badger.

ernstp at zapp:~$ more /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 4
model name      : AMD Athlon(tm) 64 Processor 3200+
stepping        : 8
cpu MHz         : 2005.635
cache size      : 1024 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
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
bogomips        : 3973.12

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