s3 crashes Dell X200 on 2.6.0-test9/ACPI 20031002

I'm trying to use S3 on my Dell X200. I have tried both

echo 3 > /proc/acpi/sleep
and
echo -n mem > /sys/power/state

It shuts down appropriately (I think), but refuses to come back. Pressing the power button does nothing. Holding the power button down does nothing. In fact, the only way I can use my computer again is to unplug the power and battery, wait 5+ minutes, and then plug it back in.

If I do this with the battery plugged in, usually the battery charging light comes on and stays on.

If I do this in text mode, I can see it print 3 lines and then vanish. The first line looks like it has a bunch of '+' and/or '-'; I have no idea what the other two lines look like.

Something tells me this is a bug in the DSDT, but I honestly have no idea. And debugging is obviously quite difficult. Any idea what I'm doing wrong, or what I should look for?

My configuration is:

Dell X200 (Pentium M3), with the A09 bios (latest on Dell's website; had the same effect with the older BIOS I was running before)

2.6.0-test9 kernel with Andrew Morton patches (as delivered by Gentoo; includes ACPI 20031002)

ACPI patch for custom DSDT (tried with and without the custom DSDT, same effect)

/proc/acpi/sleep: S0 S3 S4 S5

egrep "ACPI|APIC|MCE" /etc/kernels/config-2.6.0-test9-mm1 CONFIG_X86_GOOD_APIC=y
# CONFIG_X86_UP_APIC is not set
# CONFIG_X86_MCE is not set
# Power management options (ACPI, APM)
# ACPI (Advanced Configuration and Power Interface) Support CONFIG_ACPI=y
CONFIG_ACPI_BOOT=y
CONFIG_ACPI_INTERPRETER=y
CONFIG_ACPI_SLEEP=y
CONFIG_ACPI_SLEEP_PROC_FS=y
CONFIG_ACPI_AC=y
CONFIG_ACPI_BATTERY=y
CONFIG_ACPI_BUTTON=y
CONFIG_ACPI_FAN=y
CONFIG_ACPI_PROCESSOR=y
CONFIG_ACPI_THERMAL=y
# CONFIG_ACPI_ASUS is not set
# CONFIG_ACPI_TOSHIBA is not set
# CONFIG_ACPI_DEBUG is not set
CONFIG_ACPI_BUS=y
CONFIG_ACPI_EC=y
CONFIG_ACPI_POWER=y
CONFIG_ACPI_PCI=y
CONFIG_ACPI_SYSTEM=y
# CONFIG_ACPI_RELAXED_AML is not set

ACPI is not compiled as a module (duh)

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