Zheng,

I suspect it's a special keyboard as you suggested.  Here is some text from the M93/p Tiny User Guide:

Note: The USB 3.0 connector 4 supports the smart power on feature. If you connect a
Lenovo-recommended USB 1.1 keyboard to this connector, you can power on the computer or wake it up
from S4 hibernation mode by pressing Alt+P on the keyboard. Ensure that you use a Lenovo-recommended
keyboard that supports the smart power on feature.

The last sentence seems to stress that you need a Lenovo keyboard, or maybe they've partnered with others as well.  I wonder if the KB is made aware of the sleep state, and then only passes the keystroke through if it's Alt-p.

Thanks,
Marshall


On Thu, Sep 1, 2016 at 2:26 AM, Zoran Stojsavljevic <zoran.stojsavljevic@gmail.com> wrote:
Hello Zheng,

Since you are asking again, I looked into this problem, in order to
understand the whole PM domain more... Here is my assessment, so I
would advise you to try several options for such a problem.

I would advise to you the following steps (which, unfortunately, have
nothing to do with Coreboot for the initial test):

[1] To install the latest BIOS for ThinkCentre M6600q (Lenovo), or to
use the current, present in the platform;
[2] To drive CMOS settings to PM (Power Management) and check if PM is
properly enabled in BIOS (this is a MUST!);
[3] Then, if both steps are done, to install Ubuntu or Fedora Linux
distros (I personally prefer Fedora);
[4] To install the following package in given distro: pm-utils!
https://pm-utils.freedesktop.org/wiki/
http://pm-utils.freedesktop.org/releases/pm-utils-1.4.1.tar.gz
[5] Then to configure, make and install this package (I did it on my
VM F24 for this purpose, traces imported):
[zoran@localhost Downloads]$ cp pm-utils-1.4.1.tar.gz
/home/zoran/projects/pm-utils
[zoran@localhost Downloads]$ cd /home/zoran/projects/pm-utils
/home/zoran/projects/pm-utils
[zoran@localhost pm-utils]$ ls -al
total 212
drwxrwxr-x. 2 zoran zoran   4096 Sep  1 09:32 .
drwxrwxr-x. 8 zoran zoran   4096 Sep  1 08:59 ..
-rw-rw-r--. 1 zoran zoran 208687 Sep  1 09:32 pm-utils-1.4.1.tar.gz
[zoran@localhost pm-utils]$ tar -xf pm-utils-1.4.1.tar.gz
[zoran@localhost pm-utils]$ cd pm-utils-1.4.1/
[zoran@localhost pm-utils-1.4.1]$ ./configure
[zoran@localhost pm-utils-1.4.1]$ make
[zoran@localhost pm-utils-1.4.1]$ sudo make install
[zoran@localhost pm-utils-1.4.1]$ which pm-suspend
/usr/local/sbin/pm-suspend <<======================== S3 state
[zoran@localhost pm-utils-1.4.1]$ which pm-hibernate
/usr/local/sbin/pm-hibernate <<======================= S4 state

And then try to exercise given commands, and to revive platform using
keyboard/mouse wake up.

We'll go from there, and we'll try to debug ThinkCentre M6600q
(Lenovo) if it does not work at this stage.

Maybe somebody can advise you with Coreboot solution... But
essentially, above proposed method by me should work!

Best Regards,
Zoran

On Thu, Aug 25, 2016 at 1:05 PM, Zheng Bao <fishbaoz@hotmail.com> wrote:
>
> All,
>
> Some customers says ThinkCentre M6600q (lenovo) has the feature of wake up the system by pressing ALT-P on USB keyboard.
>
> I am wondering how it is implemented? Is it done in chipset, BIOS, or a special keyboard?
>
>
> Or when the BIOS wakeup, it reads the keystroke to see if it matches the pre-defined key. Does it sounds reasonable?
>
>
> Zheng
>
>
> --
> coreboot mailing list: coreboot@coreboot.org
> https://www.coreboot.org/mailman/listinfo/coreboot

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