ac adapter serious problem

[roberto <roberto03@gmail.com>]

hello
unfortunately, i encountered a bad problem in my laptop (Dell Latitude
D600) very frequent on these models:
sometimes, the BIOS does not recognize the ac adapter and this
seriously prevents the system performance: the CPU works at 600MHz
(instead of 2000MHz); if the battery is not at 100% then the ac
adapter cannot recharge it and so on...

now, since the current can flow inside the pc i'd like to tell Debian
to force the CPU working at full speed, without concerns about the
adapter

i post here this output since it may be helpful:

~$ cat /proc/acpi/processor/CPU0/power
active state:            C2
default state:           C1
bus master activity:     ffffffff
states:
    C1:                  promotion[C2] demotion[--] latency[000] usage[00198990]
   *C2:                  promotion[C3] demotion[C1] latency[050] usage[01315600]
    C3:                  promotion[--] demotion[C2] latency[050] usage[00000000]


thank you very much
--
roberto
OS: GNU/Linux, Debian