ACPI performance states on Sony Vaio Z1A and SRX41P

Hi Everyone,

I'm having the exact same trouble with performance states on a 
Z1A that Nicolas Bougues reported with ACPI on his SRX41P (see below).

Nicolas: did you ever resolve this?

I'm using kernel 2.4.21-rc2 + acpi-20030512.  Most other acpi stuff
(except sleep) seem to work very well.

% cat performance 
state count:             5
active state:            P0
states:
   *P0:                  1300 MHz, 26000 mW, 100 uS
    P1:                  1200 MHz, 24000 mW, 100 uS
    P2:                  1000 MHz, 20000 mW, 100 uS
    P3:                  800 MHz, 16000 mW, 100 uS
    P4:                  600 MHz, 12000 mW, 100 uS

% echo "4" > performance
acpi_processor-1095 [29] acpi_processor_set_per: Transition failed

% cat info
processor id:            0
acpi id:                 0
bus mastering control:   yes
power management:        yes
throttling control:      yes
performance management:  yes
limit interface:         yes


I tried the 2.5.69 kernel + acpi-20030512, but then I get 
"performance managment: no" in /proc/acpi/processor/CPU0/info.

I also tried "fixing" the dsdt, but compiling the original dsdt
produced no errors, so I assume there is no reason to replace
my dsdt with the recompiled one?  

Thanks!
Mark

---------------------------------------------------------------

Linux-sony] ACPI on Sony Vaio SRX41P
Nicolas BOUGUES [email protected]
Sun, 28 Apr 2002 14:38:45 +0200

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Hi lists,

I use the kernel 2.4.18 on my new SRX41P laptop, with the latest ACPI
patch (20020404). It works fairly well (events are sent and handled by
acpid, /proc/acpi entries show valid data), but I have a few
problems/questions :

- CPU throttling does work, ie its slows down the CPU. But how much
power saving can be expected ?

- Changing core CPU mode (switching from 800 to 500 MHz) does not work :

kiwi:~# cat /proc/acpi/processor/CPU0/performance
state count:             2
active state:            P0
states:
   *P0:                  800 Mhz, 9800 mW, 250 uS
    P1:                  500 Mhz, 5900 mW, 250 uS

kiwi:~# echo "1" >/proc/acpi/processor/CPU0/performance
acpi_processor-1063 [07] acpi_processor_set_per: Transition failed

Is this a known problem ? Is this specific to my laptop ?

- sleeping doesn't work well :

kiwi:~# cat /proc/acpi/sleep
S0 S3 S4 S5

cat "5" >/proc/acpi/sleep will simply turn off the computer, it's OK
cat "4" >/proc/acpi/sleep doesn't seem to do anythin
cat "3" >/proc/acpi/sleep seems to be what I want to do, ie it turns
the computer off, with the orange led blinking. But when I try to turn
it on (by pushing the power button), the green led turns on, but the
computer is hung. I have to remove the battery to reset it.

Again, is it supposed to work ? if so, what should I try ?

Thanks in advance for your help.
--
Nicolas BOUGUES
Axialys Interactive