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FromAndre Eisenbach <>
SubjectAthlon Mobile XP CPU speed problem
DateFri, 9 Apr 2004 17:23:55 +0000
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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