Alan Jenkins wrote:
> Tzy-Jye Daniel Lin wrote:
>
>> On Sat, Apr 11, 2009 at 5:41 AM, Alan Jenkins
>> <alan-jenkins@xxxxxxxxxxxxxx> wrote:
>>
>>
>>> Regression #6 on latest git! (last known good is 2.6.29-rc8)
>>>
>>> Magic SysRQ keys work though. Unfortunately, SysRq-W / SysRq-T generate
>>> too much output, so the useful bits immediately scroll off the top of
>>> the screen. I can't press SysRq-P (even if that would help), because
>>> the SysRQ key on my laptop is accessed using a Fn modifier key, which
>>> also turns the left hand side of the keyboard into a numeric pad.
>>>
>>>
>> I don't own an Eee, but having played with one, the key sequence
>>
>> Alt down
>> Fn down
>> SysRq down, up
>> Fn up
>> P down, up
>> Alt up
>>
>> should work just fine. As long as you keep holding Alt, you don't
>> need to continue holding SysRq after the initial keypress.
>>
>>
>>
>>> Magic SysRQs on my USB keyboard generate no response. (Sometimes the
>>> numlock key seems to work though. I can't tell on the laptop keyboard
>>> because the laptop doesn't have a numlock led).
>>>
>>>
>> SysRq over USB has never worked. On PC hardware, Magic SysRq depends
>> on features of the built-in i8042 controller, which only handles PS/2
>> input.
>>
>>
> Great, thanks a lot!
>
> I was able to run SysRq-P, and found the following backtrace -
>
> Pid: 0
> EIP is at acpi_idle_enter_bm+0x1df/0x208 [processor]
> cpud_idle_call
> cpu_idle
> rest_init
> start_kernel
> i386_start_kernel
>
7ec0a7290797f57b780f792d12f4bcc19c83aa4f is first bad commit
commit 7ec0a7290797f57b780f792d12f4bcc19c83aa4f
Author: Bjorn Helgaas <bjorn.helgaas@xxxxxx>
Date: Mon Mar 30 17:48:24 2009 +0000
ACPI: processor: use .notify method instead of installing handler
directly
This patch adds a .notify() method. The presence of .notify() causes
Linux/ACPI to manage event handlers and notify handlers on our behalf,
so we don't have to install and remove them ourselves.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@xxxxxx>
CC: Zhang Rui <rui.zhang@xxxxxxxxx>
CC: Zhao Yakui <yakui.zhao@xxxxxxxxx>
CC: Venki Pallipadi <venkatesh.pallipadi@xxxxxxxxx>
CC: Anil S Keshavamurthy <anil.s.keshavamurthy@xxxxxxxxx>
Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
However, reverting this commit from v2.6.30-rc1 doesn't solve the hang.
Alan
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