https://bugzilla.kernel.org/show_bug.cgi?id=16292
--- Comment #9 from Bob Zhang <bob_zhang2...@tom.com> 2010-06-29 10:44:05 ---
Sometimes, sentosa can’t power off , about 2 times every 5 times, so very
easily reproduced.
I also tried another sentosa machine : this issue is also reproduced easily (
tested 3 times, every time, can’t be power off when “shutdown –h 0”.
Through my debugging and tracing , Linux kernel’s code
“acpi_enter_sleep_state() “ is the last function to run to control ACPI
register named “PM1 controler”.
I know , from acpi spec4.0a , for entering S5 state, software only need to
write values(state that will enter) into SLP_TYPx and SLP_EN(set 1) .
Now, every times, I write sames values into these registers , but sometimes
power off failure, sometimes power off successed.
Same values into registers every time, but different hardware behavior
occurred. I want to know the details after software writing registers. What
will happen for hardware
and firmware ? especially , after SLP_EN bit has been set , what will firmware
do next step ?
From SPEC, I know , the values written to SLP_TYPx is from \_S5 object . this
value will be done some mixed, and then written into register.
I used acpidump to dump our sentosa ‘s acpi tables ,I got \_S5 object
information:
DefinitionBlock ("SSDT17.aml", "SSDT", 2, "HP ", "RX2800-2", 0x00000007)
{
Scope (\)
{
Name (\_S5, Package (0x03)
{
0x07,
0x07,
Zero
})
}
}
1, Could you help me check “{0x7,0x7}” is right for sentosa ? I think
maybe it should be {0x5,0x5}
2, Could you explain where is “{0x7,0x7} defined , which documents will
specify them ?
3, Same values into registers every time, but different hardware behavior
occurred. I want to know the details after software writing registers. What
will happen for hardware
and firmware ? especially , after SLP_EN bit has been set , what will firmware
do next step ?
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