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SubjectAthlon Mobile XP CPU speed problem
Date
Dear Linux-Kernel developers,

My notebook [1], powered by a AMD Athlon XP2400+ (k7) is slowing down when
running on battery. This happens regardless of whether or not cpu frequency
scaling is enabled or not. /proc/cpuinfo still shows maximum frequency, but
the computer is definitely slowed down considerably.

ACPI cpu info shows "throttling contro: no" and "limit interface: no".

It seems like the slowdown occurs out of control of linux cpu frequency
scaling or ACPI.

What may cause this slow-down?
Is there any driver/kernel option which may let me control this behaviour?

Current kernel version used 2.6.5-mm1 with cpufreq and ACPI compiled in.

Thanks,
André Eisenbach

------
[1] Compaq Presario 2100z


/proc/cpuinfo:

processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 10
model name : mobile AMD Athlon(tm) XP2400+
stepping : 0
cpu MHz : 1788.568
cache size : 512 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 sep mtrr pge mca cmov pat
pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow
bogomips : 3538.94

/proc/acpi/processor/CPU0/info

processor id: 0
acpi id: 0
bus mastering control: yes
power management: yes
throttling control: no
limit interface: no
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