S3 and S4: nothing happens

Anyone can help me with this:
If I do a "echo 3 > /proc/acpi/sleep" or a "echo 4 > /proc/acpi/sleep" nothing happens (using 2.5.41 and 2.4.20-pre8-acpi). There isn't any message in /var/log/messages.

A "cat /proc/acpi/sleep" gives me: S0 S3 S4 S5

Any suggestions?
Thanks, Roy!

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Same thing happen here, using 2.4.20-pre8 w/acpi-20021002-pre8, /proc/acpi/sleep gives S0 S3 S4 S5, but "echo 3 > /proc/acpi/sleep", or 4. Give nothing.

Also, /proc/acpi/processor/CPU0/performance gives not supported. Is that simply for 2.4.xx or some error?

I have a Fujitsu C-6631 w/a P3-1Ghz.

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This _is_ fixed with 20021002-2.5.40 though this patch has not yet been applied to the linus kernel tree (AFAIK). Thus it is not included with 2.5.41, but you can easily fix it yourself - see [1]on that.

+ /* only support S1 and S5 on kernel 2.4 */

Regards
-Knut

[1] Mail from Pavel Machek with title "acpi sleep: stupid bug reintroduced"

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