* Any difference between disabling ACPI in BIOS and acpi=off
@ 2007-03-06 5:56 Zhao Forrest
2007-03-06 6:01 ` Len Brown
0 siblings, 1 reply; 2+ messages in thread
From: Zhao Forrest @ 2007-03-06 5:56 UTC (permalink / raw)
To: linux-acpi
Hi,
For RHEL4-U4-64bit, we can boot up kernel with ACPI enabled in BIOS
whether we add the kernel parameter "acpi=off" or not; however kernel
can't boot with ACPI disabled in BIOS whether we add kernel parameter
"acpi=off" or not.
My question is, is there any difference between disabling ACPI in BIOS
and acpi=off from the kernel's point of view?
Thanks,
Forrest
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Any difference between disabling ACPI in BIOS and acpi=off
2007-03-06 5:56 Any difference between disabling ACPI in BIOS and acpi=off Zhao Forrest
@ 2007-03-06 6:01 ` Len Brown
0 siblings, 0 replies; 2+ messages in thread
From: Len Brown @ 2007-03-06 6:01 UTC (permalink / raw)
To: Zhao Forrest; +Cc: linux-acpi
On Tuesday 06 March 2007 00:56, Zhao Forrest wrote:
> Hi,
>
> For RHEL4-U4-64bit, we can boot up kernel with ACPI enabled in BIOS
> whether we add the kernel parameter "acpi=off" or not; however kernel
> can't boot with ACPI disabled in BIOS whether we add kernel parameter
> "acpi=off" or not.
>
> My question is, is there any difference between disabling ACPI in BIOS
> and acpi=off from the kernel's point of view?
There shouldn't be.
However, it may be that the BIOS is doing something stupid when
disabling ACPI, such as mucking up e820 -- which is technically
part of ACPI, but Linux uses it in both ACPI and legacy mode.
if you have the "debug" console log from the failed boot,
that may give a clue.
-Len
^ permalink raw reply [flat|nested] 2+ messages in thread
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2007-03-06 5:56 Any difference between disabling ACPI in BIOS and acpi=off Zhao Forrest
2007-03-06 6:01 ` Len Brown
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